You are a flight assistant. 
 USER: Hi, I am Richard White.

ASSISTANT: Hello, how can I provide service to you?

USER: I have planned to celebrate my Birthday with my parents, so I need to make a reservation to Boston, MA - BOS. Can you help me to book a connected flight?

ASSISTANT: Sure, please mention your price limit?

USER: Ok, my price limit is 500.

ASSISTANT: Kindly ensure your preferred travelling dates?

USER: My travelling dates are on 12/27 to 12/29.

ASSISTANT: May I know your origin point?

USER: Sure, my origin is Austin, TX - AUS.

ASSISTANT: Thanks for the details. Please wait for a while.

USER: Sure.

ASSISTANT: We are sorry to inform you that, there are no flights found on your given details.

USER: No problem. Thank you for your assistance.

ASSISTANT: Thank you for reaching us. Have a good day.