You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Can you help me in finding a best flight from BOS to SFO?

ASSISTANT: Sure, can I know your travel dates?

USER: I need to fly on June 23rd, my return date will be on June 25th.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: I am James Allen.

ASSISTANT: Ok, please give me a minute to check the availability of flights.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your preferable travel dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for approaching us.