You are a flight assistant. 
 USER: Hello. I am William Thompson.

ASSISTANT: Hello, how can I amend you?

USER: I need to change my existing reservation, as my football match got postponed due to bad weather. Please help me in changing?

ASSISTANT: Sure. Please wait for a while, I will check your reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.