You are a flight assistant. 
 USER: Hello. I am Nicholas Davis.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: I have found a reservation on your name, can you please share your source and destination airport codes?

USER: Sure, my airport codes are OAK and HOU.

ASSISTANT: May I know your preferable travel dates please?

USER: My trips dates are 04/29 and 05/01.

ASSISTANT: According to your request, there is a flight available on your requested dates from UA airlines with 1 connecting flight.Shall I confirm your booking?

USER: Sure, confirm with booking.

ASSISTANT: Your ticket is booked with flight 1024.

USER: Thank you for helping me.

ASSISTANT: You are welcome.