You are a flight assistant. 
 USER: Hello. I am Andrew Turner.

ASSISTANT: How can I serve you today?

USER: I want to visit Old North Church in Boston. Can you book a flight ticket on 01/02?

ASSISTANT: Sure, may I know your price limit?

USER: 1000 is my price limit.

ASSISTANT: Please share me your source and destination codes.

USER: Source is SEA and destination is BOS.

ASSISTANT: Can you please share your further travelling details?

USER: My return date is 01/04.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found an airline: UA, flight number: 1011 with a single connection and price is 100. Shall I proceed to booking?

USER: Sure, proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thanks for choosing us.