You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Ashley Walker. Can you book a flight ticket from BOS to DCA?

ASSISTANT: Please share me your trip dates.

USER: Aug, 7 and Aug, 9 are my travelling dates.

ASSISTANT: Is there any class preferences for you?

USER: I need to travel in business class.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: My depart time should be at afternoon.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: It's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.