You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Can you please book me a ticket in a direct flight?

ASSISTANT: Sure, can I have your travel dates please?

USER: Sure, my journey dates are 04/17 and 04/19.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: My source and destination airport codes are ORD and CLT.

ASSISTANT: Please wait a moment.

USER: Ok, make sure that it's a direct flight.

ASSISTANT: Sorry to inform you that no flight is available to you with connection 0.

USER: That's ok, thank you for giving the information.

ASSISTANT: May I know your good name please?

USER: My name is Gregory Garcia.

ASSISTANT: Thank you for choosing us, have a good day.