You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, I am happy to help you in flight ticket booking modification. May I know your name for checking purpose?

USER: Sure, my name is Katherine Jackson.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our previous list to modify the ticket.

USER: That's ok, thank you.

ASSISTANT: You are most welcome and thank you for reaching us.