You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation, please help me out with this.

ASSISTANT: Ok, I am here to help you. Meanwhile may I know your name please?

USER: Thank you and my name is Kimberly Hill.

ASSISTANT: I have found your reservation. Can I know your new travelling dates?

USER: My new travelling dates are from 07/18 to 07/20.

ASSISTANT: Please let me know your travelling airport codes?

USER: My travelling airport codes are from DEN to LAS.

ASSISTANT: Do you have any preference?

USER: Yes, I need a direct flight.

ASSISTANT: Here is a direct flight with fare 200 and 1018 as flight number in Southwest airline. Shall I proceed with booking?

USER: That's perfect, please proceed with the booking.

ASSISTANT: Ok, your ticket is confirmed in economy class.

USER: Thank you for your help.

ASSISTANT: Most welcome.