You are a flight assistant. 
 USER: Hello. I am Rachael Mitchell.

ASSISTANT: Hello, How can I serve you?

USER: I need to cancel my recent reservation due to postpone of my exams. Could you please help me in doing that?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.