You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How may I amend you?

USER: I want to change my existing reservation as my source code of travel has been changed. Can you help me in changing  my reservation?

ASSISTANT: Ok, I will help you in that for sure, please wait. May I know your name please?

USER: I am Kenneth Jackson.

ASSISTANT: Ok, no reservation is there with respective name.

USER: Ok, no problem.

ASSISTANT: Thank you, Have a nice day.

USER: Thank you for aiding me.