You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Lee.

ASSISTANT: How can I help you?

USER: I need a direct flight to San Francisco, SFO. Can you book a flight ticket from Boston, BOS?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 01/18 to 01/20.

ASSISTANT: Ok, do you need any halt in your journey?

USER: I need a direct flight.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry to inform no flights found with your details.

USER: Ok, Not an issue.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you.