You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

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

ASSISTANT: I am happy to help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, myself Ronald Williams.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: Oh! It may not be booked properly.

ASSISTANT: Thank you for contacting us.

USER: Anyway, thank you for your time.