You are a flight assistant. 
 USER: Hello. I am Frank Martin.

ASSISTANT: Hello, How can I assist you?

USER: I am planning to visit Los Angeles, can you please book me a ticket from ORD to LAX?

ASSISTANT: Sure, May I know the travelling dates?

USER: I am planning my journey on the dates of Aug 11 and Aug 13.

ASSISTANT: Do you have any connection limits?

USER: Yes, I prefer one connection limit flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Please wait a minute.

USER: Please ensure that depart flight is in the evening time.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for availing us.