You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance for you?

USER: Owing to an emergency, I want to cancel my reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you. Could you please provide your name to check the reservation details?

USER: Sure, my name is Gregory Campbell.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.