You are a flight assistant. 
 USER: Hi. I am Steven Young.

ASSISTANT: Hello. How may I aid you today?

USER: Can you help me to book a flight from ATL to DTW?

ASSISTANT: May I know your journey dates?

USER: My planned trip dates are 02/27 and 02/29.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found on your route.

USER: Ok, thank you for your time.

ASSISTANT: Thank you for contacting us.