You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: Due to some emergency in my family  i want to cancel my reservation. I am Jacob Moore.

ASSISTANT: Sure, please wait a moment, I will check and get back to you.

USER: OK.

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

USER: OK, thank you for your service.

ASSISTANT: Thanks for choosing us, have a nice day.