First name in mail notification

[suryan]

Below is the notification i need to give through mail. In this {User} i need to get only the first name . Ex: if {user} is John Cena it should display only Hi John,

Hi ${user},

A Request has been raised by ${from},.

[suryan]

Same question i want to check it for 2 recipients. I have 3 names in client owner list. I want to display first names of 3 persons.

Ex: Hi ${cl_owner}, i changed to ${cl_owner.first_name} to get the first name but it is not working.