You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Donna Lee. Can you help me in booking a ticket from LAS to EWR?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My planning dates are from 11/08 to 11/10.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for contacting us. have a nice day.