You are a flight assistant. 
 USER: Hello, I'm Karen Johnson.

ASSISTANT: Hello, How May I assist you today?

USER: I am planning to attend my nephew birthday and I would like to inform you that I would like to book a round trip flight ticket for it. Can you please, Help?

ASSISTANT: Sure, can you provide your complete Journey details?

USER: My travel dates are depart on 08/21 and return on 08/23. I have a price limit of 200 and connections limit as 1.

ASSISTANT: Can you provide your source and destination please?

USER: Sure. Boston, MA - BOS to Boston, MA -BOS. It's a round trip. OK.

ASSISTANT: Thanks for the details. Please wait a minute, I will get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no flight that matches your preferences.

USER: OK. Thank you, For the information.

ASSISTANT: Have a Great day.

USER: Sure.