You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Jonathan Lee.

ASSISTANT: Ok.

USER: I want to attend a Seminar in Houston. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: When you are willing to travel?

USER: My travelling dates are from 03/22 to 03/24.

ASSISTANT: May I know your source airport code please?

USER: My airport codes are from DCA to IAH.

ASSISTANT: Do you have any specifications?

USER: I would prefer single halt.

ASSISTANT: Ok, please wait.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting, we found connecting flight 1015 in Frontier airline with fare of 100. Shall I proceed to book?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket has been booked.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us.