You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you today?

USER: I'm Justin Carter. Please book a ticket from San Francisco, CA-SFO to Boston, MA-BOS, for an auto show.

ASSISTANT: Ok, when are you willing to travel?

USER: 08/07 is departure date and will return by 08/09.

ASSISTANT: We found a connecting flight with fare of 200 in AA airline. Shall I proceed for booking?

USER: Please book a flight.

ASSISTANT: Your ticket has been booked.

USER: Please let me know flight number?

ASSISTANT: 1021 is flight number. Thank you for contacting us.

USER: Thanks.