You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Jason Roberts. I want to meet my friend at Boston, can you please book my flight ticket from IAD to BOS?

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

USER: Thank you. I would like to depart on Mar 9 and I prefer to return in the morning on Mar 11.

ASSISTANT: Ok, do you have any specifications?

USER: Yes, I need single connection flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: Sorry Jason Roberts, there are no flights available on your requested dates.

USER: Sad to hear that, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.