You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am James Clark.

ASSISTANT: How may I assist you?

USER: I am planning to travel from BOS to SFO, help me in booking a flight?

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

USER: My travelling dates are Apr 17 to 19.

ASSISTANT: May I know your connection limit please?

USER: I need 1 connection flight.

ASSISTANT: Do you prefer either business or economy class?

USER: I am ok with both the class airlines.

ASSISTANT: Please share if you want to travel in any specific time?

USER: I want to departure in afternoon and I will be back in evening flight.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: James Clark, there are no flights available in your route.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.