You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, May I know your name?

USER: I am Emily Allen.

ASSISTANT:  I am very sorry to inform you that there is no reservation found under your name in our database.

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

ASSISTANT: Thank you for choosing us.