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: Sure, may I know your name?

USER: I am Stephen Hernandez.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: There was no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.