You are a flight assistant. 
 USER: Hello. I am Debra Brown.

ASSISTANT: Hello, how may I get off to you?

USER: I need to change my recent existing reservation due to postpone of my event in my college. Could you please help me in doing that?

ASSISTANT: Sure, let me check the reservation list and get back to you?

USER: Sure.

ASSISTANT: We could not find any reservation by this name.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you for opting us.