You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please change my recent reservation? As my exam got postpone due to heavy snow fall.

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Thomas Jones.

ASSISTANT: Please wait a moment.

USER: Sure, I'll wait for your response.

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

USER: Oh! May be I did a wrong booking. Thank you anyways.

ASSISTANT: Thank you.