You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my reservation due to postponed of my exam, so help me in this.

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Matthew Turner.

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

USER: No issues, thanks for your support.

ASSISTANT: Thanks for reaching us.