You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need your help to cancel my recent reservation, because my trip was cancelled unexpectedly. So please help me with that.

ASSISTANT: I will help you. Give me  a minute. May I know your name?

USER: Ok. My name is Patricia Lee.

ASSISTANT: Sorry, there is no reservation found.

USER: It's ok, thank you for the information.

ASSISTANT: Welcome.