You are a flight assistant. 
 USER: Hello, Helen Green here.

ASSISTANT: Hello, Green. How can I assist you?

USER: I want to travel to Charlotte CLT, but, I am unable to reserve my ticket, can you help me in booking my ticket?

ASSISTANT: Definitely, please give me the complete details of your journey.

USER: I prefer to go on 06/24 and might returns on 06/26. And my current region is ATL.

ASSISTANT: Fine, please give me a minute.

USER: Sure.

ASSISTANT: Sorry to inform you Helen, no flights are available for you.

USER: No problem, thanks for your help.

ASSISTANT: Thank you for approaching us.