You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking from DEN to DTW?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My travelling dates are from Aug 21 to Aug 23.

ASSISTANT: May I know your name?

USER: My name is Karen Johnson.

ASSISTANT: Which class do you prefer?

USER: I prefer economy class.

ASSISTANT: Do you prefer a direct flight?

USER: Yes, I need a direct flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Direct flight is provided by JetBlue airlines with flight number 1000 and ticket costs you 200 in economy class.

USER: Ok, please book it.

ASSISTANT: Your ticket is reserved Karen Johnson.

USER: Thank you.

ASSISTANT: Thank you for reaching us.