You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My holiday trip has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, my name is Stephanie Rodriguez.

ASSISTANT: Ok Rodriguez, hold on for a moment please.

USER: Sure.

ASSISTANT: Sorry to say this Rodriguez, in our data base we could not find a reservation with your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.