You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Kathleen Roberts. Please book a flight ticket from AUS to DEN.

ASSISTANT: Sure, I am here to help you with that, can you share me your travelling dates?

USER: Mar, 31 and Apr, 2 are my travel dates.

ASSISTANT: Do you have any connection limit?

USER: I need single connection.

ASSISTANT: Is there any time concern?

USER: My return time should be at afternoon.

ASSISTANT: Can you have any other specifications?

USER: No, thanks.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.