You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Allen.

ASSISTANT: How may I assist you?

USER: Can you help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Sorry Gregory Allen, there is no reservation on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you.