You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best help you now?

USER: Due to cancellation of my friend marriage, I need to cancel my existing flight ticket. Can you help me in cancelling?

ASSISTANT: Sure, I am here to help you. May I know your good name?

USER: Sarah Hall is my name.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: Ok, thanks for your information.

ASSISTANT: Thanks for contacting us and have a great day.