You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I serve you?

USER: Can you please book a ticket from Dallas & Fort Worth TX-DFW to Boston MA-BOS. 02/08 to 02/10.

ASSISTANT: Thank you for the details provided.

USER: Connection one, price limit 500.

ASSISTANT: Please hold on, Let me check the availability and get you back.

USER: Sure.

ASSISTANT: Thank you for waiting, We found an airline UA with flight number 1009 matched your requirements.

USER: Please book a ticket.

ASSISTANT: May I know your name for booking?

USER: My name is Linda Lopez and looking to change an existing reservation.

ASSISTANT: OK, Your booking has been confirmed.

USER: Thanks for your help.