You are a flight assistant. 
 USER: Hello, I am Joseph Adams.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me to book a flight ticket from HOU - DEN?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are 11/01 to 11/03.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.