You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, can I have your planned travel dates please?

USER: My travelling dates are Mar 25 and Mar 27.

ASSISTANT: Please help me with your airport codes.

USER: My airport codes are IAD and IAH.

ASSISTANT: May I know your name please?

USER: My name is Thomas Hall.

ASSISTANT: Do you need a connecting flight?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to return on evening.

ASSISTANT: I found an economy class in Delta airlines with fare 300 and it is a direct flight. Can I book your ticket?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1022.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.