You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to cancel my recent reservation because my trip dates are got postponed, can you help me?

ASSISTANT: May I know your good name please?

USER: I am Mark Parker.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our database.

USER:  That's ok,thank you for checking.

ASSISTANT: Thank you for opting us.