You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Could you please help me in booking a ticket from BOS to SFO where I have a meeting to attend.

ASSISTANT: Can you please let me know your travelling dates?

USER: My itinerary travel dates are as follows Jan 10 and Jan 12.

ASSISTANT: Do you have any class preference?

USER: I would like to board a single connecting flight.

ASSISTANT: May I know your name?

USER: Regarding my time concern, depart should be in the evening and return in the evening too.

ASSISTANT: Is there any other specifications for your journey?

USER: No. My name is Ronald Davis.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Ronald Davis, based on you required specifications we haven't found any flights in airline database.

USER: No issue, thank you for the information.

ASSISTANT: Thanks for reaching us.