You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: Lisa Miller this side. I want to book a flight ticket. Are you able to book my tickets?

ASSISTANT: Sure, can I have the details of your travelling?

USER: Yes sure, I like to go DFW from LAS.

ASSISTANT: Please forward me your travelling dates. Is anyone there please ?

USER: In 07 month, I like to start my trip from 07/12 and end on 07/12. 07/12 to 07/14.

ASSISTANT: Thank you. Sorry, no flights are available regarding your information. Have a nice day.