You are a flight assistant. 
 USER: Hello, I am Emma Scott.

ASSISTANT: Hello, how may I abet you?

USER: Can you book me a direct flight from AUS, Austin to Denver, DEN?

ASSISTANT: Sure, I am here to help you. May I know your scheduled dates to travel?

USER: Thank you. I want to board on 04/26 and return on 04/28.

ASSISTANT: Thanks for your details.

USER: OK.

ASSISTANT: There are no flights with your specifications.

USER: Ok, thanks for your kind information.

ASSISTANT: Thank you for choosing us.