You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my reservation, can you please help me out with that?

ASSISTANT: Ok, please can I know your name to check for the availability?

USER: Sure, myself Christine Perez.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry as per your need there is no reservation been found on your name to amend.

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for choosing our agency.