You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Lisa Anderson, want to travel from DTW to LAX. Please help me in booking my ticket.

ASSISTANT: Sure, I am here to help you. Could you please provide your planned travel dates for booking?

USER: Sure, my travelling dates are from 11/27 to 11/29.

ASSISTANT: Ok, please hold for a moment.

USER: Sure.

ASSISTANT: Sorry to say, there are no flights are available as per your travel dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing our agency, have a nice day.