You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a direct flight ticket?

ASSISTANT: Sure, can I know your airport codes please?

USER: My airport codes are MSP and DEN.

ASSISTANT: Ok, let me know your trip dates.

USER: My travel dates are Aug 01 and Aug 03.

ASSISTANT: Ok, do you have any other requirements?

USER: No, thanks for asking.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, thank you for the information.

ASSISTANT: Can I know your name?

USER: I am Jennifer Clark.

ASSISTANT: Ok, thank you for approaching us.