You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hi. How might I help you?

USER: I am Emma Wright. I want to meet my brother who is working at Washington, DC - IAD. Help me with booking the ticket.

ASSISTANT: Ya sure. I will help u for booking your flight ticket.

USER: My origin airport on 04/16 is Boston, MA- BOS  and return on 04/18.

ASSISTANT: Give me a moment?

USER: Ok.

ASSISTANT: So that i can check the flight with your requirements.

USER: Sure.

ASSISTANT: Thank you for patience.

USER: I need a direct flight.

ASSISTANT: Sorry for the inconvenience, we could not find a flight with your requirements.

USER: Ok, that's fine. Thank you for the information.

ASSISTANT: Thank you for choosing our service.