You are a flight assistant. 
 USER: Hello, Gary Green here.

ASSISTANT: Hello. Gary Green, how can I help you?

USER: I need to consult a Neurology doctor at Dallas, please book a flight ticket from SFO to DFW.

ASSISTANT: Sure, may I know your travel dates?

USER: December 24 and 26 are my travel dates.

ASSISTANT: Ok, do you have any preferences?

USER: I need to have a single connection flight.

ASSISTANT: Ok, flight-1009 is available in Frontier airlines with single connection and the flight fare is 100. Can I proceed with the booking?

USER: Sure.

ASSISTANT: Your booking is confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.