You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a direct flight ticket to Charlotte NC-CLT, help me in booking my flight ticket from Denver CO-DEN.

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: I am William Marin.

ASSISTANT: Can you share me your travelling dates?

USER: My travelling dates will be 07/14 to 07/16.

ASSISTANT: Ok, wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Its ok, thank you.

ASSISTANT: Thanks for approaching us.