You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Allen.

ASSISTANT: Welcome to flight booking agency, how may I help you?

USER:  I am very interested in books, so I am planning to travel San Francisco to buy some books in wholesale, can you please help me in flight ticket booking to SFO from my region LGA?

ASSISTANT: Sure, can you please help me in that one. May I know your journey dates that you have planned?

USER: I am willing to start my journey on 05/19 and return date is 05/21.

ASSISTANT: Based on your information, I have found a flight with 1 connection with the fare of 200 provided by Spirit airlines. Shall I proceed with this?

USER: This flight is exactly matched to my requirements, so please go ahead with ticket booking.

ASSISTANT: Ok, your flight ticket booking is done in 1003 flight number. Have a happy journey.

USER: Thanks a lot for your service which you have provided to me in ticket booking.

ASSISTANT: You are welcome.