You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Donna Hall, can you find a direct flight for me?

ASSISTANT: Sure, can you share me your preferable dates?

USER: Ok, my trip dates are from Apr 21 to 23.

ASSISTANT: I need to know your travelling airport codes?

USER: Fine, my locations are from JFK to ATL.

ASSISTANT: Do you have any specifications?

USER: Ok, I need a flight with normal-cost.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.