You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Perez here.

ASSISTANT: How can I help you?

USER: I want to attend a seminar on automation, could you book my ticket from MSP to ATL?

ASSISTANT: Let me know your travel dates.

USER: My trip dates are Oct 6 and Oct 8.

ASSISTANT: Do you have any preference?

USER: I want to return in the afternoon.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: No problem, thank you.

ASSISTANT: Thank you.