You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service do you need from us?

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

ASSISTANT: Ok, I can check your reservation status. \.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, myself David Garcia.

ASSISTANT: Sorry for the inconvenience, there is no active reservation found on your name in the chart list.

USER: Oh! It may not be booked properly while booking.

ASSISTANT: Ok.

USER: Anyway, thank you for your time.

ASSISTANT: My pleasure, thank you for approaching us.

USER: Most welcome.