You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Actually my Foot Ball competition is postponed so that I want to change an existing reservation, can you help me?

ASSISTANT: Sure, may I know your name?

USER: Yes, I am Joseph Allen.

ASSISTANT: Please, wait a moment Allen.

USER: Ok.

ASSISTANT: Sorry to say that no reservation found.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for reaching us.