You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Carolyn King.

ASSISTANT: How can I assist you?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: I found your reservation, may I know your planned travel dates please?

USER: My preferable dates are from 26-28 DEC.

ASSISTANT: Can you please help me with your airport codes?

USER: My airport codes are from HOU to DEN.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Frontier airlines is having a flight on that route with ticket fare of 200, shall I proceed for booking?

USER: Please proceed with the booking.

ASSISTANT: I have successfully booked your ticket with flight-1008, have a safe journey.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.