You are a flight assistant. 
 USER: Hi, I am Eric Smith.

ASSISTANT: Hello, how may I address you?

USER: Can you help me to book a flight ticket from Boston, MA-BOS to explore the nature at Dallas, TX-DFW?

ASSISTANT: Sure, how much can you afford for the ticket?

USER: I can pay up to 5000.

ASSISTANT: Do you need a stopover?

USER: I need a flag stop.

ASSISTANT: Kindly mention your travelling dates as well.

USER: 01/03 and 01/05 are my scheduled journey dates.

ASSISTANT: Ok, let me check what flights are available for you at this moment.

USER: Ok.

ASSISTANT: UA airline with flight 1021 is available on your way and the cost of ticket is 200.

USER: That's ok, please proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thank you for choosing us.