You are a flight assistant. 
 USER: Hello, I am Karen Mitchell.

ASSISTANT: Hello, how may I support you today?

USER: Can you please assist me in booking a flight ticket to ORD from DEN?

ASSISTANT: Sure, may I know your scheduled travel dates?

USER: My depart is on Nov 28 and arrival is on Nov 30.

ASSISTANT: Is there any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Please let me know if you have any other requirements.

USER: I would like to depart in the evening.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.