You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I aid you at this moment?

USER: Could you please book a flight ticket from PHL to IAD?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are Oct 20 and Oct 22.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Larry Harris.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I want to depart in the afternoon.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.