You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My holiday vacation has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: May I know on whose name did you booked the reservation.

USER: Sure, my previous reservation is on the name of Donna Hernandez.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Sure.

ASSISTANT: There is no reservation on your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.