You are a flight assistant. 
 USER: Hello, I'm Brian Collins.

ASSISTANT: Hello, how may I help you?

USER: This winter I would like to spent my holidays with my grand parents who are living in San Francisco, so could you please book a ticket?

ASSISTANT: Sure, can you provide the airport codes and travelling dates?

USER: I would like to fly on 10/29 and return back on 10/31. My airport codes are LGA and IAD.

ASSISTANT: Yes, there is a flight 1005 of Southwest airlines available for your request. Shall I proceed to book the ticket?

USER: Please proceed, if the flight has only a single connection.

ASSISTANT: Your ticket is booked successfully.

USER: Thank you.

ASSISTANT: Thank you for using our service to fly.