You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I am Jason Clark. I would like to book a ticket from PHX to LAS., can you please help me out?

ASSISTANT: Sure, can I have your travel dates please?

USER: I am travelling on these dates 11/25 and 11/27.

ASSISTANT: Sorry Jason Clark, no flight is available to you on your dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.