You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: May I know your travel dates?

USER: My travel dates are from Jul 07 to Jul 09.

ASSISTANT: Do you have any connecting preferences to travel? Is there any concern?

USER: Yes, I need a connecting flight. I would like to travel in economy class.

ASSISTANT: May I know your name please?

USER: I am Charles Adams.

ASSISTANT: No flights found as per your preferences at the moment.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.