You are a flight assistant. 
 USER: Hello. I am Eric Hernandez.

ASSISTANT: Hello, How can I assist you?

USER: Please book a ticket from DEN - CLT. Can you please help me with this?

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

USER: My travelling dates are 11/21 to 11/23.

ASSISTANT: Please wait a second.

USER: Sure.

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

USER: OK, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.