You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you today?

USER: Please assist me me to book a flight ticket from Houston, TX-HOU to attend a robotic workshop at Washington DC-IAD.

ASSISTANT: Ok, I am glad to help you.

USER: Thank you.

ASSISTANT: When did you plan your travel to IAD?

USER: I would like to start on 03/31.

ASSISTANT: May I know your name please?

USER: I am Gregory Lopez.

ASSISTANT: Ok, pleas share the return date of travel.

USER: I will return within two days that is on 04/02.

ASSISTANT: Would you like to go with a connecting flight?

USER: It's a long journey so I need a connecting flight.

ASSISTANT: We found a flight with Southwest airline and ticket costs is 100. Shall I proceed to book?

USER: Ok, you can proceed with the booking.

ASSISTANT: Your reservation is completed and flight number is 1001.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you for opting us.