You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Ok, may I know your name?

USER: Sure, myself Kenneth Collins.

ASSISTANT: Ok ,please wait. Sorry, no reservation found on your name to change.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.