You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. How can I help you ?

USER: In Feb, I want to travel to Dallas, can you help me to book a ticket?

ASSISTANT: Sure please provide me your travel details .

USER: I want to travel from NC-CLT to TX-DFW.

ASSISTANT: May I know your name & date of travelling please.

USER: My name is Paul Hill. My travel dates are 02/20 and 02/22.

ASSISTANT: I am sorry Mr Paul Hill , there is no flight as per your requirement .

USER: OK fine. Thank you for your wonderful service.

ASSISTANT: Thank you .