You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I provide assistance to you?

USER: I would like to change my existing reservation as my meeting got postponed. Can you help me with it?

ASSISTANT: Sure, I'm here to help you. Could you please let me know your name to check the reservation status?

USER: Reservation was made on the name of Nicole Green.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for being patient. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for contacting us.