You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Virginia Roberts here, I want to visit San Francisco, can you please help me to book a ticket from DTW to SFO?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: Sure, my preferable dates of journey is from 12/21 to 12/23. Please make sure that the price limit is 200.

ASSISTANT: Here is a flight with 1 flight and price is 100 in UA airlines, can I proceed with it?

USER: Ok, please go ahead with this ticket booking.

ASSISTANT: Your ticket has been booked with 1007 flight.

USER: Thank you for your help.