You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How can I serve you today?

USER: Please book a flight from Philadelphia, PA-PHL to San Francisco, CA-SFO, for holiday vacation.

ASSISTANT: Sure, Can you share your dates of travel for processing further booking?

USER: Depart by 11/12 and return on 11/14.

ASSISTANT: Please, provide your name.

USER: My name is Kathleen Williams.

ASSISTANT: Wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time Kathleen Williams. We have found a flight with Spirit airline of 1012 flight number. Charge is 300 and a connecting flight.

USER: Please book a flight.

ASSISTANT: Ticket has been booked.

USER: Thanks.