You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER:  I am Gary Allen.

ASSISTANT: How can I assist you today?

USER:  I want to change my existing reservation, please help me out.

ASSISTANT: Sure, will you please give me a moment?

USER: Ok.

ASSISTANT: Thanks for waiting, your reservation is found. Will you mention your travelling dates please?

USER: My travelling dates are from Dec 30th to Jan 1st.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: My source code is DEN and destination code is IAH.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is a flight with price 200 and the connections 1 is available. Shall I confirm your ticket?

USER: Please proceed.

ASSISTANT: Your ticket is booked. The flight number is 1029 and the airline is JetBlue.

USER: Thanks for the reservation.

ASSISTANT: Welcome, have a great day.