You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Rachel Carter. Due to a sudden medical emergency of one of my friend, our tip to Las Vegas has been cancelled. Could you help me in cancelling the reservation?

ASSISTANT: Sure Carter. Please give me a moment.

USER: Ok.

ASSISTANT: Sorry Carter, I could not found any reservation under your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Most welcome.