You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER:  I would like to cancel my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Please share your name to proceed further?

USER: I am Ronald Smith.

ASSISTANT: No reservation found as per your preferences at the moment.

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

ASSISTANT: Thank you for choosing us.