You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Myself Charles Robinson from Austin. For my football match, I want to visit DTW. Can you please book a flight tickets from AUS to DTW?

ASSISTANT: Sure, may I know your travel dates?

USER: Thank you for your positive response, I want to take off on 10/10 and please book my return ticket also on 10/12.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: As per your intent, there are no flights available.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.