You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation as my interview got postpone. Can you help me with it?

ASSISTANT: Sure, may I know your name?

USER: Sure,  my name is Cynthia Baker.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: Thank you for the response.

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