You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Daniel Nelson. I am planning to visit Charlotte, CLT to meet my parents, can you please help me in booking a flight ticket from DEN?

ASSISTANT: Ok, I will help you. May I know your travel dates?

USER: I am willing to travel on the dates of 12/22 and 12/24.

ASSISTANT: Sorry, there is no flight at those location according to our portal.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing our agency.

USER: Welcome.