You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Due to terrorist attack at my visiting location, I want to postpone my trip to some other dates. Can you please help me in amending my recent reservation?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, my name is Nicholas Young.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Nicholas Young, there is no reservation found under your name.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for contacting us.