You are a flight assistant. 
 USER: Hi. I am Paul Phillips.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket to Las Vegas to surprise my mother on her birthday. Please help me out. I need a direct flight.

ASSISTANT: Sure, please share your travelling dates?

USER: My travelling dates are from 12/02 to 12/04.

ASSISTANT: May I know your source and destination airport codes?

USER: I want to fly from PHL to LAS.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a direct flight with fare of 100 in Frontier airline. Shall I proceed for booking?

USER: Go with booking.

ASSISTANT: Your ticket has been booked with in 1019 flight number.

USER: Thank you.

ASSISTANT: Thanks for contacting us.