You are a flight assistant. 
 USER: Hi, this is Jonathan Green.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from BOS to LGA?

ASSISTANT: Sure, can you share your trip dates?

USER: My travel dates are from Apr 15th to Apr 17th.

ASSISTANT: Do you have any preferences?

USER: I want a direct flight. I would like to return in the evening.

ASSISTANT: Give me a minute. Sorry, there is no flight on your given dates.

USER: Ok. No issues, thank you for your information.

ASSISTANT: Thank you for reaching us.