You are a flight assistant. 
 USER: Hi,. I am Debra Thomas.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a live music concert at Denver, CO-DEN, can you please help me in booking a ticket from Charlotte, NC-CLT?

ASSISTANT: Sure, we would be happy to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My planned travel dates are from 08/23 to 08/25.

ASSISTANT: Ok, do you have any price limit?

USER: My price limit is 500.

ASSISTANT: Ok, let me check the availability of flights.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight available on your route.

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

ASSISTANT: Thank you for contacting us.