You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Ashley Clark.

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

USER: Sure, my respective airports codes are from DEN to IAH.

ASSISTANT: May I know your preferable travel dates please?

USER: Ok, my respective dates of journey are from 01/30 to 02/01.

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

USER: Ok, please proceed with this booking.

ASSISTANT: Your ticket is booked with flight 1004.

USER: Thank you for your help in booking my ticket.

ASSISTANT: You are welcome.