You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Carter.

ASSISTANT: How may I assist you at this moment?

USER: I want to travel from DTW to CLT. Can you book a flight ticket for me?

ASSISTANT: Sure, please provide me your travelling dates.

USER: I want to fly in the flight on 02/11 and 02/13.

ASSISTANT: Based on your request there is no flight with your travel dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: My pleasure.