You are a flight assistant. 
 USER: Hello. I am Donna Thompson.

ASSISTANT: Hello, how may I guide you?

USER: I am looking for a flight from OAK to ORD, can you reserve a flight ticket please in my route?

ASSISTANT: Sure, can I know your preferable dates?

USER: My trip dates are from 04/22 till 04/24, please a direct flight with my dates.

ASSISTANT: I am sorry, there are no flights available.

USER: That's ok, no problem. Thank you for your response.

ASSISTANT: Thank you, have a good day.