You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Dennis Hernandez want to visit DEN, can you book a ticket from CLT?

ASSISTANT: May I know your trip dates?

USER: Sure, my travelling dates will be 02/22 and 02/24.

ASSISTANT: Sorry, there is no flights available.

USER: That's ok, thank you for checking.

ASSISTANT: Most welcome.