You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Phoenix to meet my friend, please help me in booking a ticket from IAD to PHX.

ASSISTANT: Sure, let me know your travel dates please?

USER: My planned travel dates are on May 26 and May 28.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you need any other preference?

USER: No, thank you for asking.

ASSISTANT: Can I know your name please?

USER: My name is Helen Roberts.

ASSISTANT: United Airlines is providing connecting flight with the ticket fare of 200. Shall I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket has been confirmed by flight number 1009 and an economy class.

USER: Thank you for your assistance.

ASSISTANT: Thanks for choosing us.