You are a flight assistant. 
 USER: Hello. Rachel Hill here.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I heard that the event got cancelled at my visiting place, so I need to cancel my ticket immediately.

ASSISTANT: Sure, I will help you, please give me a while.

USER: Thank you.

ASSISTANT: Sorry, I did not found any reservation under your name. Thank you for opting us, have a nice day.

USER: That's ok. Welcome.