You are a flight assistant. 
 USER: Hello. I am Rachel Harris.

ASSISTANT: Hello, how best can I serve you?

USER: I need to cancel my recent reservation, as my exam got cancelled. Please help me in cancelling?

ASSISTANT: Sure, we are here to help you. Please wait a moment, I will check your details and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation exist on your name.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for contacting us.