You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Pamela Thomas. I am planning to visit the Denver Zoo at Denver CO - DEN, so please help me in booking a flight ticket from PA - PHL.

ASSISTANT: May I know your travel dates?

USER: I want to fly on 12/21 and return on 12/23.

ASSISTANT: We found a connecting flight Southwest with flight number 1006 and fare is 100. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT:  Thank you for opting us.