You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Shirley Young here.

ASSISTANT: How may I help you?

USER: I am looking for direct flight for my business trip to Denver. Can you book the flight ticket?

ASSISTANT: May I know your trip dates?

USER: The trip dates are from Oct 02 to Oct 04.

ASSISTANT: Please share your airport codes.

USER: The airport codes are from PHL to DEN.

ASSISTANT: Do you have any connection limit?

USER: I prefer a direct flight.

ASSISTANT: There is a direct flight-1019 in economy class, shall I book it?

USER: I am fine with the airlines. You can book it.

ASSISTANT: Ok, booking is done on Southwest airlines.

USER: Thank you.

ASSISTANT: Thanks for reaching us.