You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I aid you today?

USER: Please book my ticket from DTW to AUS.

ASSISTANT: Sure, to book a ticket may I know your name please?

USER: Mark Nelson here.

ASSISTANT: Help me with your travelling dates?

USER: My trip dates are Dec 9 and Dec 11.

ASSISTANT: Kindly mention your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I want to depart from Detroit in the morning.

ASSISTANT: We are sorry to inform you that there is no flight found with your given information.

USER:  Mark Nelson here. No problem, thank you.

ASSISTANT: Thank you.