You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help to book a business class flight ticket?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travel dates are Aug 05 and Aug 07.

ASSISTANT: Can I know you name?

USER: I am Catherine Hernandez.

ASSISTANT: OK, let me know your source and destination airport codes?

USER: My airport codes are ORD and DFW.

ASSISTANT: Ok, do you have any connection limit?

USER: Yes, I prefer connecting flight for this trip.

ASSISTANT: Sorry, no flights are available on your route.

USER: No problem, thank you for the information.

ASSISTANT: Welcome, have a nice day.