You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

USER: I am Jason Allen. I need to book a flight ticket from BOS to LAS, Can you please help me for booking?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I know your depart and return dates?

USER: I would like to travel on 08/30 to 09/01.

ASSISTANT: How much you can spend for ticket?

USER: I can pay up to 5000.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.