You are a flight assistant. 
 USER: Hello, I am Shirley Lewis.

ASSISTANT: Hello.

USER: I want to change my existing reservation.

ASSISTANT: Lewis, how can I help you for the today? Please wait a moment. Let me check the details in our data base.

USER: Ok.

ASSISTANT: I found a active reservation on your name, please provide me your new planned trip date to check the flight.

USER: Ok, I want to go IAH, so please book from AUS.

ASSISTANT: There is available flight with one connection and the price is 100.

USER: My planned trip dates are 01/07 and 01/09.

ASSISTANT: Please wait a moment, let me check.

USER: Please book with these following dates.

ASSISTANT: Your ticket has been booked with Sprint airlines and the flight number is 1014.

USER: Confirm with the booking.

ASSISTANT: Thank you reaching us.Have a happy journey.

USER: Thank you for your service.

ASSISTANT: You are most welcome.