Add contact salutation in mailing

Hi.
I want to use the email compagne to create a newsletter for clients and prospects.
I would like to add the salutation of the person in front of their first and last name but I can not figure out the variable to use.
In the list of variables I see values for email, last name, first name and so on, but nothing for the salutation.
Could someone help me out here please because I don’t want to send out a mail starting “Hello John Doe” but be a bit less casual with “Hello Mr. John Doe”.

Thanks in advance.

Hello,

Don’t understand your question, you can put the Hello word, in front of the __CONTACT_NAME_BILLING__ ?

Hello.
Thanks for your feedback.
To make my question more clear, I am trying to create a newsletter by the email campaign tool.
The variables that are shown to me in the tool tip are the following:
USER_SIGNATURE
USER_ID
USER_LOGIN
USER_EMAIL
USER_PHONE
USER_PHONEPRO
USER_PHONEMOBILE
USER_FAX
USER_LASTNAME
USER_FIRSTNAME
USER_FULLNAME
USER_SUPERVISOR_ID
USER_JOB
USER_REMOTE_IP
MYCOMPANY_NAME
MYCOMPANY_EMAIL
MYCOMPANY_PHONE
MYCOMPANY_FAX
MYCOMPANY_PROFID1
MYCOMPANY_PROFID2
MYCOMPANY_PROFID3
MYCOMPANY_PROFID4
MYCOMPANY_PROFID5
MYCOMPANY_PROFID6
MYCOMPANY_CAPITAL
MYCOMPANY_FULLADDRESS
MYCOMPANY_ADDRESS
MYCOMPANY_ZIP
MYCOMPANY_TOWN
MYCOMPANY_COUNTRY
MYCOMPANY_COUNTRY_ID
MYCOMPANY_COUNTRY_CODE
MYCOMPANY_CURRENCY_CODE
DAY
DAY_TEXT
DAY_TEXT_SHORT
DAY_TEXT_MIN
MONTH
MONTH_TEXT
MONTH_TEXT_SHORT
MONTH_TEXT_MIN
YEAR
PREVIOUS_DAY
PREVIOUS_MONTH
PREVIOUS_YEAR
NEXT_DAY
NEXT_MONTH
NEXT_YEAR
DOL_MAIN_URL_ROOT
(AnyTranslationKey)
(AnyTranslationKey|langfile)
[AnyConstantKey]
ID
THIRDPARTY_CUSTOMER_CODE
EMAIL
LASTNAME
FIRSTNAME
MAILTOEMAIL
OTHER1
OTHER2
OTHER3
OTHER4
OTHER5
CHECK_READ
UNSUBSCRIBE

The on you mentioned is not in there and the mailing has nothing to do with the billing either. I tried it but the variable is not being replaced.