You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Kenneth Thompson.

ASSISTANT: Kenneth, how can I assist you?

USER: I want to visit a historical place in Boston.can you book a ticket from AZ - PHX to MA - BOS?

ASSISTANT: Sure, can you provide your travel dates?

USER: The departure is on 05/19 and return is on 05/21. The connection limit is 1.

ASSISTANT: Flight number 1021 of UA airlines is available for you.

USER: Ok. Can I know the price?

ASSISTANT: Ticket price is 100.

USER: Ok.

ASSISTANT: Can I proceed with your booking?

USER: Yes, proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.