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

ASSISTANT: Hello, How can I serve you?

USER: I want to attend Daniel Boone Pioneer festival in San Francisco, SFO. Can you please book a flight ticket on 09/26 to 09/28?

ASSISTANT: Sure, I am mirthful to help you. Do you need any connection in between your journey.

USER: Yes, I need one connection.

ASSISTANT: Ok, May I know the boarding point?

USER: My source point is BOS.

ASSISTANT: Is there any price limit?

USER: Price limit should be under 500.

ASSISTANT: Ok, wait for a minute, I will revert you with the availability.

USER: Sure.

ASSISTANT: We are very sorry to notify you that there is no flight found based on your details.

USER: Ok, no issue. Thank you for your help.

ASSISTANT: Thank you for opting us, Have a great day.