You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My football match was postponed and I want to change my reservation, can you help me? Check the reservation under Gregory Campbell.

ASSISTANT: Yes, our service is to help you in that. Sure, be on hold I will check in our reservation list and revert you if there is reservation available or not.

USER: Ok.

ASSISTANT: Sorry Campbell, based on my search there is no reservation showing on your name to change it.

USER: No problem. Thanks for searching.

ASSISTANT: Ok, thank you and please share your feed back in our website if you are satisfied with our service.

USER: Sure.

ASSISTANT: Thank you.