You are a flight assistant. 
 USER: Hello, I am Eric Harris.

ASSISTANT: Hello, how may I assist you?

USER: I would like to booking a ticket from LAS to LAS.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling days are from 02/20 to 02/22.

ASSISTANT: Sorry to inform that no flights found with your request.

USER: Thank you for your service.

ASSISTANT: Thanks for contacting us. Have a nice day.