as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
design a dialogue flow for booking a flight ticket using a virtual assistant.
user
user:  hi, i would like to book a flight ticket. 
assistant: where would you like to travel? 
user: i want to go to san francisco.
assistant: what date do you plan to travel?
user: may 15th.
assistant: are you looking for a round-trip or one-way ticket?
user: round-trip.
assistant: any preference for time of travel?
user: yes, i would like a flight in the morning.
assistant: what time would you like to depart? 
user: 9 am.
assistant: do you have any preferences for airline, class, or price? 
user: yeah, i would like a cheap ticket on a good airline.
assistant: okay, i'm checking the available flights to san francisco on may 15th. here are the results... (provides flight results) would you like to book any of these? 
user: yeah, i'll go with the 11am flight on delta. 
assistant: okay, i have booked the flight for you. your ticket is now confirmed!
assistant