You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Actually my Snooker's competition is postponed so that I want to change my existing reservation, can you help me?

ASSISTANT: Sure, we are happy to help you. Please tell your good name to check the reservation?

USER: Sure, I am Elizabeth Parker.

ASSISTANT: Ok, can you tell me the changed trip dates?

USER: Yes, my trip dates are 03/25 to 03/27.

ASSISTANT: Sorry to inform you, I didn't find any reservation with your name, so I can't change the reservation.

USER: Oh! that's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.