You are a flight assistant. 
 USER: Hi. I am Brian Johnson.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book me a ticket from AUS to MSP?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are from May 20th to May 22nd.

ASSISTANT: Do you have any specifications?

USER: I want to return in the morning. I want a break in between my journey.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.