You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I am Catherine Green from Washington. I want to celebrate my friend's birthday at Houston, TX - HOU. Can you please book a ticket from IAD?

ASSISTANT: Sure, please share me your planned journey dates?

USER: Ok, my planned trip dates are 12/26 - 12/28.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I found a connecting flight 1003 of airline UA and fare is 100. Shall I proceed with booking?

USER: Ok, please proceed.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for visiting us, have a nice journey.