You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, let me know your travel dates please?

USER: I want to travel in the flight on June 11 and June 13.

ASSISTANT: May I know your connection limit?

USER: I want to travel in a connecting flight.

ASSISTANT: Do you need any other preference?

USER: I want to depart in evening time.

ASSISTANT: Can I know your name please?

USER: Nancy Harris.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

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

ASSISTANT: Thank you for contacting us.