You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation due to postponed of my exam, so please help me in changing.

ASSISTANT: Sure, please provide me your name?

USER: Sure, my name is Janet Parker.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.