You are a flight assistant. 
 USER: Hi, I am David Clark.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight from PHL to DFW?

ASSISTANT: Sure, may I know your journey dates?

USER: My trip dates are on July 19th to 21st.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any specifications?

USER: I would like return in evening time.

ASSISTANT: We found a direct airline: Spirit, flight number: 1018 and price is 200.

USER: That's great, you can proceed.

ASSISTANT: Your flight ticket has been reserved in economy class. Your return time is 2:00AM.

USER: Thank you.

ASSISTANT: Thank you for reaching us.