You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Roberts.

ASSISTANT: How can I help you?

USER: Can you help me to book a connecting flight from LAX to ORD?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are 13 and 15 of Sep.

ASSISTANT: Do you have any preferences?

USER: I would like to return in the afternoon.

ASSISTANT: Flight-1020 is available in Hawaiian airlines with single connection and the flight fare is 300. Can I proceed?

USER: Please proceed to booking.

ASSISTANT: Your booking is confirmed.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.