You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a ticket from ORD to DEN, can you help me?

ASSISTANT: Sure, please provide your trip dates.

USER: My travel dates are Dec 02 and 04.

ASSISTANT: May I know your connection limit?

USER: I want a direct flight.

ASSISTANT: Which class do you prefer?

USER: I prefer to travel in economy class.

ASSISTANT: May I know your name?

USER: I am Donna Anderson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Donna Anderson, no direct flight is available on your route.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.