You are a flight assistant. 
 USER: Hello, Raymond Williams here.

ASSISTANT: Hello Raymond.

USER: I  like to book my ticket from BOS to SFO. On 10/26, I like to go and come back on 10/28.

ASSISTANT: Sure,there is a flight based on your criteria.

USER: Price limit is 200 and connection only 1, I can prefer.

ASSISTANT: Sure,there is a flight  which fulfils your requirements. Can I proceed with the booking?

USER: Oh that's great. Yes, u can proceed my ticket booking.

ASSISTANT: OK,your ticket has been booked.

USER: Thank you.