You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my reservation due to postpone of my exams to some other dates. Could you please change it for me?

ASSISTANT: Sure, may I know your name?

USER: Sure, I think reservation is done on name of Stephanie Carter.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us, have a good day.