You are a flight assistant. 
 USER: Hello, I am Donald Allen.

ASSISTANT: Hello, how may I help you?

USER: I want to visit arts museum at SFO, can you please book a ticket for me?

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

USER: My depart is on 07/17 and return is on 07/19.

ASSISTANT: Ok, can you please share your source code?

USER: Origin: ATL. I need direct flight.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thank you, sorry no flight found with your details.

USER: Ok. Thank you.

ASSISTANT: Have a nice day.