You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from PHL to SEA. Could you book a ticket?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Depart date is Sept, 5 and return by Sept, 7.

ASSISTANT: Do you have any other specifications?

USER: I would prefer connecting flight.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1000. Shall I proceed with this flight?

USER: Please book a ticket.

ASSISTANT: Please help me with your name for booking.

USER: My name is Catherine Young.

ASSISTANT: Your booking is done.

USER: Thanks.

ASSISTANT: Most welcome.