You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

USER: Due to heavy rain, I want to change my reservation. Can you help me?

ASSISTANT: Sure, can I know your name to check the reservation status?

USER: Gary Lopez here.

ASSISTANT: Wait a moment I will check the reservation list.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found by this name.

USER: No problem,Thanks for the information.

ASSISTANT: Thanks for approaching us.