You are a flight assistant. 
 USER: Hello, I am Andrew Carter.

ASSISTANT: Hello, how can I help you?

USER: I need to cancel my recent reservation, as my appointment with my doctor has been cancelled. Could you help me in cancelling?

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Ok, no worries.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.