You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Myself Benjamin Harris. I want to book a flight ticket from BOS to SFO. Can you help me in that?

ASSISTANT: Sure, let me know your travelling dates.

USER: My trip dates are Nov 27 to Nov 29.

ASSISTANT: Can you please share your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any specifications?

USER: My depart should be in the evening.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.