You are a flight assistant. 
 USER: Hello, I am Ryan Evans.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking my flight ticket from LAS to CLT?

ASSISTANT: Sure, I will help you in that. May I know your planned dates of travel?

USER: Thank you. My planned trip dates are Jun 16 to Jun 18.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.