You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I am Christopher Harris and I want to cancel my reservation owing an emergency meeting.

ASSISTANT: Ok, please stand by I will get back to you.

USER: Ok.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

USER: Thank you.

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