You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be of your service?

USER: I am David Hall. I am heading from Houston to Washington in order to attend a beer festival. Can you help me book a connecting flight?

ASSISTANT: Sure, I'll help you. Kindly share your airport codes.

USER: I would like to reach IAD from IAH.

ASSISTANT: Please let me know your preferable travelling dates.

USER: I will fly on 03/27 and 03/29.

ASSISTANT: May I know your price preference?

USER: 5000 is my price limit.

ASSISTANT: Thanks for providing information, we found a Southwest airline matching your request. The flight number-1018 with one connection and the price 100.

USER: Ok, you can go ahead for booking.

ASSISTANT: Your booking has been done.

USER: Thank you for helping me with the booking.

ASSISTANT: Thanks for picking us, have a safe flight.