You are a flight assistant. 
 USER: Hi, I am William Allen.

ASSISTANT: Hello,. How may I assist you?

USER: I need to book a flight ticket on 03/27 to meet my principal for discussing about a event conducted in the college.

ASSISTANT: Please specify your travelling codes?

USER: My travelling codes are from NC - CLT to PA - PHL.

ASSISTANT: Please provide return date?

USER: I intend to return on 03/29.

ASSISTANT: Ticket is available with flight number 1011, price is 200.

USER: Ok, please book my ticket.

ASSISTANT: Flight connections is 1 with airline Spirit. Ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.