You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I aid you today?

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

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: I am Emma Brown.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

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

ASSISTANT: Thank you for approaching us.