You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Alexander Nelson. I would like to book a ticket to Charlotte, can you please help me out?

ASSISTANT: Sure, can you please let us know your airport codes?

USER: I am flying from ATL to CLT.

ASSISTANT: Ok, let me know your journey dates.

USER: I am travelling on these dates 08/19 and 08/21.

ASSISTANT: Ok, please wait for sometime.

USER: Make sure my connection limit is 0.

ASSISTANT: Nelson, no flights available on your preferred dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us and have a nice day.