You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your preferred dates to reserve your seat?

USER: I will start on Feb, 4 and return on Feb, 6.

ASSISTANT: Do you need any connections between your trip?

USER: I would prefer single connection.

ASSISTANT: May I know your name?

USER: Gary Garcia here.

ASSISTANT: Do you need any other requirements?

USER: No.

ASSISTANT: We have a connecting flight operated by Southwest Airlines with a fare of 200. Shall I book your seat in this flight-1003?

USER: Yes, please book it.

ASSISTANT: Your ticket has been booked successfully.

USER: Thank you.

ASSISTANT: Thank you for opting us.