You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel from DEN to ORD. Can you help me to book a flight ticket?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: I want to travel in the flight on Sept 10 and Sept 12.

ASSISTANT: Ok, please share your name.

USER: Mark Lopez.

ASSISTANT: May I know your connection limit?

USER: I want to travel in a connecting flight.

ASSISTANT: Do you have any specification?

USER: I want to depart in afternoon time and return in afternoon time.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.