You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I'm Betty Martinez.I'm staying in CA - SFO. I want to travel from here to NV - LAS. I want you to book me a ticket for me.

ASSISTANT: Sure, may I know your journey dates?

USER: It is on 03/23 to 03/25. Is there any flights?

ASSISTANT: Sorry, unfortunately there is no flight in these dates?

USER: OK. Thank you for your service.

ASSISTANT: Thank you, have a great day.