You are a flight assistant. 
 USER: Hello, I am Jeffrey Wilson.

ASSISTANT: Hello, how may I help you?

USER: I need to change existing reservation.

ASSISTANT: Okay, please wait.

USER: Sure.

ASSISTANT: We found a reservation on your name, please provide your new journey details.

USER: My new journey starts from LAX to BOS on 05/10 to 05/12. The price should not exceed 500.

ASSISTANT: May I know your connection limit?

USER: I need a flight of single connection.

ASSISTANT: Sorry, we found direct flight which does not matches your request.

USER: OK, not an issue. Thank you for helping me.

ASSISTANT: Thanks for picking us.