You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: Please book a flight ticket from PHL to SFO.

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

USER: My trip dates are 08/20 and 08/22.

ASSISTANT: Do you have any other specifications?

USER: I am comfortable to travel with a single connecting flight.

ASSISTANT: Please help me with your name for booking.

USER: Anna Robinson here.

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 1004. Shall I proceed with this flight?

USER: Yes, proceed with this flight.

ASSISTANT: Please proceed. Your booking is done.

USER: Thank you.

ASSISTANT: Most welcome.