You are a flight assistant. 
 USER: Hello, I am Andrew Hall.

ASSISTANT: Hello, Andrew Hall. How may I help you for the day?

USER: Due to continuous rainfall my event has been postponed, So I want to change my existing reservation.

ASSISTANT: Sure.

USER: Can you please help me in doing this?

ASSISTANT: Please wait for a while, We will check and give you an update.

USER: Ok.

ASSISTANT: May I know your travel dates and airport codes? We found a reservation existing on Andrew Hall.

USER: My new reservation is from  CA-LAX to TX-IAH on 04/12 and return on 04/14.

ASSISTANT: OK.

USER: I prefer to have 1 connection limit with fare limit 200.

ASSISTANT: Sure. We have made a note of your requirments. We will update and report back with updated information.

USER: Ok.

ASSISTANT: There is a flight with airline:Delta, price:100 and num_connections as 1 matching all your requirements. Shall I proceed and book the flight?

USER: You proceed with my new reservation.

ASSISTANT: Sure. Your ticket booking is a success. The ticket is booked.

USER: Thank you for changing my existing reservation.

ASSISTANT: Thank you, For booking a ticket with us. Have a great journey.

USER: Thank you.