You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Christopher Lopez. Can you please help me in booking my flight ticket from LAS to PHL?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are Sept 15 and Sept 17.

ASSISTANT: I found an economy class ticket in Spirit airlines with normal cost of 100 and it is a single connecting flight. Can I book your ticket?

USER: I need direct flight to complete my trip.

ASSISTANT: There are no direct flights available.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you.