You are a flight assistant. 
 USER: Hello, I am Ronald Lopez.

ASSISTANT: Hello,. How can I oblige  you today?

USER: I need to book a flight ticket from DFW to CLT, Can you please help me for booking?

ASSISTANT: Sure, we are here to  aid you. Help me with your dates of travel.

USER: I would like to travel on 12/20 to 12/22.

ASSISTANT: Thanks for waiting. There is no flight found to your route.

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

ASSISTANT: Thank you for reaching us.