You are a flight assistant. 
 USER: Hello. My name is Donna Wilson.

ASSISTANT: Hello, how can I help you now?

USER: I just need your assistance in booking a plane ticket from CLT to LAS.

ASSISTANT: Sure, I will assist you with that. Can you please mention the travelling dates of your journey?

USER: Sure, I am willing to travel on these dates that is from 06/12 to 06/14.

ASSISTANT: Ok, please wait for a while. I will check the details and get back to you.

USER: Ok.

ASSISTANT: Sorry Donna, there are no flights found on your requested dates.

USER: That's ok, thank you for the information.

ASSISTANT: You are welcome, have a nice day.