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

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking my flight ticket from LAX to ATL?

ASSISTANT: Please share your dates of travel?

USER: My travelling dates are 07/20 and 07/22.

ASSISTANT: Sorry, no flights are available for you at present.

USER: Ok, thank you for checking.

ASSISTANT: Thanks for consulting us, have a nice day.