You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I amend you?

USER: I want to change my reservation with the name of Mark King, as The weather is not good.

ASSISTANT: Ok. Please wait for a while.

USER: Ok.

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

USER: Not a problem.

ASSISTANT: Thank you for opting us.