You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Nicole Wilson here, can you please book a flight for my journey from DCA to BOS?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My journey dates are from Jan 1st to Jan 3rd.

ASSISTANT: Do you have any class preferences?

USER: Any class is ok but I need a direct flight.

ASSISTANT: Do you have any airline preferences?

USER: No, I need my return time in afternoon.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No, thanks for asking.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Oh! That's ok. Anyways, thank you for checking.

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

USER: Most welcome.