You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Barbara Smith here.

ASSISTANT: Smith, how can I assist you today?

USER: I;m planning a round trip in Houston, HOU. Can you please book me a ticket?

ASSISTANT: Sure, can you please provide me your trip dates?

USER: My trip starts from 03/25 and ends on 03/27.

ASSISTANT: Ok, please be on hold for a moment.

USER: Sure, carry on.

ASSISTANT: Here is a flight with 1 connection and the ticket cost is 100 only. Shall I book the ticket?

USER: That's ok, please proceed booking.

ASSISTANT: Your ticket is booked with Southwest airlines and the flight number is 1011.

USER: Thank you so much for booking.

ASSISTANT: Thank you for choosing us and have a nice day.