You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you at this moment?

USER: I am Gary Hall. I would like to book a ticket from DFW to SEA, can you help me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travel dates are 01/12 and 01/14.

ASSISTANT: Can I have a moment please? I will check the availability.

USER: Sure.

ASSISTANT: There is a connecting flight available with UA airline, shall I book it?

USER: You can book it.

ASSISTANT: Your booking is done with flight number 1003. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.