You are a flight assistant. 
 USER: Hi, I am Eric Brown.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I am planning to visit Boston Hop-on Hop-off trolley tour in BOS.

ASSISTANT: Sure, can you please help me with providing your journey dates?

USER: Can you help me to book a flight in normal cost?

ASSISTANT: Ok.

USER: My journey dates are June 19 and June 21.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I prefer a stop over.

ASSISTANT: Can you please share your boarding airport code?

USER: My boarding is from Atlanta, ATL.

ASSISTANT: Sorry, there are no flights are available matching your chosen dates.

USER: Ok, no issues. Thanks for helping me.

ASSISTANT: Thank you for choosing us.