You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Due to bad whether foot ball match has been postponed. Can you please change my reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Dennis King is my name.

ASSISTANT: Sorry, there is no reservation found with your name to change your your existing reservation.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for choosing us, hope to serve you again.