You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of assistance are you seeking from us?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Ok, please can I know your name to check for the status of your reservation?

USER: I am Frank Martin.

ASSISTANT: Please hold on for a while I will check.

USER: Sure.

ASSISTANT: Thank you for waiting Mr. Frank Martin. Sorry as per our records your flight ticket is not found to amend.

USER: Ok, no problem. Thank you for approaching us.

ASSISTANT: You are welcome, thank you for choosing our agency Mr. Frank Martin.