You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Thomas Carter here, I want to reserve my ticket for a city roundup trip at Charlotte, can you please help me to book a ticket from CLT to CLT?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: Sure, my dates of journey is from 02/15 to 02/17. Please make sure that the price limit is 200.

ASSISTANT: Sorry Carter, there is no flight with your dates.

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

ASSISTANT: Thank you for reaching us.