You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Nancy Jackson. Can you please help me in booking a flight ticket from Boston, BOS to Washington, IAD?

ASSISTANT: Sure, when are you planning to make your trip?

USER: My schedule dates are from Aug 28 to Aug 30.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: At what time do you want to return and depart?

USER: My return time is afternoon.

ASSISTANT: How many connections are you looking for?

USER: I need a direct flight.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.