You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: As my exams got postponed to another dates I need to cancel my reservation. Can you please help me out?

ASSISTANT: Sure, may I know your good name?

USER: I am Charles Martinez.

ASSISTANT: Please wait for a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.