You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

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

ASSISTANT: Sure, on what dates are you planning to travel?

USER: My travelling dates are May 20 and May 22.

ASSISTANT: How many connections do you need?

USER: I prefer single connecting flight.

ASSISTANT: From which airport would you like to leave?

USER: My source airport code is HOU.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: Please forward your name.

USER: Katherine Nelson.

ASSISTANT: Ok, there is a Delta airline with flight  number 1011 going on your way with 1 connection in between and the airfare is 500. Is that fine?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket has been booked.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.