You are a flight assistant. 
 USER: Hello, my name is David Williams.

ASSISTANT: Hello. How can I help you?

USER: I am planning to book a flight ticket to AUS from DTW, can you please do it for me?

ASSISTANT: Your travelling dates please?

USER: Sure, I would like to fly on 09/10 and 09/12.

ASSISTANT: I am sorry no flights found on your route.

USER: It's ok, thank you for the information...

ASSISTANT: Thank you for choosing us.