You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to heavy rains my match has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, we are glad to help you. Can you please provide your name?

USER: Gary Roberts is my name.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, we did not find any reservation with your name.

USER: Ok, it's not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your kind response.