You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at present?

USER: I made a reservation earlier to attend for a CBI secret meeting which is going to be held at Boston, due to some issues my meeting place has been changed. Can you please help me to change my reservation?

ASSISTANT: Sure, we are here to assist you to change it. Ok, please provide the name on which you have booked your ticket earlier?

USER: Sure, ticket was booked on the name of Gregory Jackson.

ASSISTANT: Thanks for providing your name. Please be on hold, I will check the present status of your earlier reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for being hold, there was no reservation registered in our database.

USER: Ok. Thank you for providing information.

ASSISTANT: Thank you for approaching our service.