You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Rodriguez.

ASSISTANT: How can I assist you?

USER: I want to book a ticket from EWR to EWR. Could you help me?

ASSISTANT: Sure, may I know your journey dates please?

USER: My preferable dates are from 02/26 to 02/28.

ASSISTANT: Wait for a while please. Donna Rodriguez, there are no flights available in your route.

USER: That's ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for reaching us.