You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Please see if there is any possibility to change my dates of travel, as my trip got postponed to other dates.

ASSISTANT: Sure, can I know your name?

USER: Yes, my name is Nancy Taylor.

ASSISTANT: Please hold on for a moment, let me check for any existing reservation.

USER: Ok, please check.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: That's fine, I will find other means of travel to reach my destination. Thank you for your information.

ASSISTANT: Thank you, have a good day.