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

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a flight ticket to San Francisco with price under 500, can you please help me with it?

ASSISTANT: Sure, I will help you, may I know your travelling dates?

USER: Travelling dates 01/29 and 01/31.

ASSISTANT: Could you please help me with your airport codes?

USER: Airport codes are DFW-SFO.

ASSISTANT: Please share your lay by's.

USER: I need a lay by in between the journey.

ASSISTANT: There is a Spirit 1015 airline with fare of 200 which matches your stopover's. Shall I proceed with booking?

USER: You can proceed with booking.

ASSISTANT: Your booking has been confirmed on name of Richard Hill.

USER: Thanks for the help.

ASSISTANT: Thank you for a picking us.