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

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from PHL to IAH?

ASSISTANT: Sure, I will help you. Can you share your journey dates?

USER: Sure, I would like to go on 12/24 and return back on 12/26.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Frontier airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 500.

ASSISTANT: Your booking is done with flight number 1000.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.