You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to book a flight ticket from DEN to ORD. Could you help me in booking?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from June 26 - 28.

ASSISTANT: Can you please share your name?

USER: Melissa Hill.

ASSISTANT: Is there any connection limit?

USER: I prefer for direct flight.

ASSISTANT: Do you have any other specification?

USER: I prefer to travel in economy class.

ASSISTANT: Melissa Hill, there are no flights available in your route.

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

ASSISTANT: Thank you for choosing us.