You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand today?

USER: This is Deborah Clark. I want to visit Houston to enjoy my holidays, please help me to book a flight ticket?

ASSISTANT: Sure, could you please share your planned journey dates?

USER: My journey dates are from 09/26 to 09/28.

ASSISTANT: Please specify your airport codes?

USER: My source airport code is PA - PHL and my destination airport code is TX - IAH.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: There is a  AA airline with flight 1004 and fare 100 having a lay by. Shall I proceed with booking?

USER: Ok, please go ahead.

ASSISTANT: Your booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for reaching us.