You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I want to cancel my recent reservation due to sudden postpone of my job joining date. Can you help me with that?

ASSISTANT: Sure, May I know your name?

USER: Sure, I am Stephanie Walker.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Thank you for your quick service.

ASSISTANT: Thank you for choosing us.