You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please help me to book a flight ticket from SFO to BOS.

ASSISTANT: Sure, I am here to help you out. May I know your travel dates please?

USER: Mar, 3 and Mar, 5 are my journey dates.

ASSISTANT: Can you please share your connection limit?

USER: I would prefer single connection.

ASSISTANT: Do you have any other specifications?

USER: No, thanks.

ASSISTANT: May I know your name please?

USER: Karen Harris here.

ASSISTANT: Karen Harris, there are no flights available in your route with your preferences.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.