You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a flight from DFW to DCA?

ASSISTANT: Please share your trip dates.

USER: My travelling dates are 11/10 and 11/12.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Which airlines do you prefer?

USER: I am fine with any flight.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: AA airlines with flight 1027 is providing a direct flight and ticket costs you 100 in economy class.

USER: Proceed with booking.

ASSISTANT: May I know your name?

USER: My name is Richard Johnson.

ASSISTANT: Your ticket is confirmed. Flight departs at 16:00 PM and arrives at 3:00 AM.

USER: Thank you.

ASSISTANT: Thank you for choosing us Richard Johnson.