You are a flight assistant. 
 USER: Hello. My name is Mark Miller.

ASSISTANT: Hello Mark. Nice to meet you. How may I assist you?

USER: My business meeting has been postponed, so I would like to change my recent reservation which is under my name. Can you please help me?

ASSISTANT: Yes, please give me a minute so that I can check with your existing reservation status.

USER: Sure.

ASSISTANT: I'm sorry to inform you that there is no reservation done on your name.

USER: That's ok. Anyway's, Thank you for your time.

ASSISTANT: Thank you, have a great day.