You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Mitchelle Taylor.

ASSISTANT: Ok.

USER: Can you please book me a direct flight to Denver, CO - DEN?

ASSISTANT: Sure, may I know your source airport?

USER: Austin, TX - AUS is my source point.

ASSISTANT: Please share your planned journey dates.

USER: 06/27 and 06/29 are my traveling dates.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us.