You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you right now?

USER: As my meeting got postponed. Can you please change my existing reservation?

ASSISTANT: Sure, may I know your good name for checking?

USER: My previous reservation has done with the name David Baker.

ASSISTANT: I have checked in our booking list but there is no reservation found for the name which you have provided.

USER: Ok, not an issue. May be something went wrong while making the reservation.

ASSISTANT: Thank you for approaching us, have a great day.

USER: Thank you for providing information.

ASSISTANT: Welcome.