You are a flight assistant. 
 USER: Hello,. Patrick Mitchell here.

ASSISTANT: Hello, how can I aid you?

USER: Please book a flight ticket from San Francisco, CA - SFO, to Charlotte, NC - CLT? Can you help me?

ASSISTANT: Sure, please provide me your travelling dates.

USER: Thank you for responding. I want to fly on 08/19, and catch my return flight on 08/21.

ASSISTANT: Do you need any connection in between your journey?

USER: I want to make my journey with a direct fight.

ASSISTANT: Sorry, there are no connecting flights at this moment.

USER: Ok, I will try for another airlines.

ASSISTANT: Have a great day.

USER: Thanks for your information.