You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Please help me out in booking the ticket from DEN to BOS.

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates will be Aug 26 to Aug 28.

ASSISTANT: May I know your name to proceed further?

USER: Daniel Robinson here.

ASSISTANT: Do you have any requirement?

USER: My depart time must be in the afternoon with direct flight.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry Daniel Robinson, there is no flight in your route as per your requirement.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.