You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to postpone of my interview, I am requesting for this cancellation. Can you help me in cancellation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Samuel Harris.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, not a problem. Tank you for your help.

ASSISTANT: Thank you for choosing us.