You are a flight assistant. 
 USER: Hello. I am David Taylor.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I would like to travel from DFW to PHL. Can you please help me to book a ticket?

ASSISTANT: Sure, I can help you in finding a best flight on your route.

USER: Thank you.

ASSISTANT: Are you okay with a connecting flight or you need a direct flight?

USER: I need a connecting flight.

ASSISTANT: When are you planning to reach PHL?

USER: I want to start on 08/20.

ASSISTANT: How much airfare are you expecting for this booking?

USER: Fare is 200.

ASSISTANT: Do you need a return ticket also?

USER: Yes, I intend to return on 08/22.

ASSISTANT: Ok, let me check what flights are available for you?

USER: Ok.

ASSISTANT: I was trying to find a cheaper flight on your route but there are no flights available at this moment.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.