You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to change my reservation due to my planned event got postponed so please help me with that.

ASSISTANT: Sure, I will help you. May I know your name please?

USER: Thank you. Sure, myself Virginia Johnson.

ASSISTANT: There is no reservation on your name in our database.

USER: Oh! It may not be booked properly.

ASSISTANT: Thank you for opting us.

USER: Anyway, thank you for your time.