You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Sure, Cynthia Jackson here.

ASSISTANT: Please wait for a while, let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Sorry to intimate that, no reservation is found with your criteria.

USER: No problem, thank you for the information.

ASSISTANT: Thank you very much for approaching our agency.