You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Virginia Miller, I am willing to book a flight ticket with direct flight. Please, assist me about it.

ASSISTANT: May I know your trip codes?

USER: Sure, my trip dates are 08/26 and 08/28.

ASSISTANT: Please provide me your travel dates?

USER: My source code is DTW and destination code is DEN.

ASSISTANT: Sorry, no flight found with your details.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for opting us.