You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Owning a business trip in Las Vegas, can you book the ticket for me?

ASSISTANT: Sure, let me know your travel codes?

USER: My location codes are from JFK to LAS. My preferable dates of travelling will be from 06/03 till 06/05.

ASSISTANT: Wait, let me check for availability.

USER: Sorry, check the flights on 09/03 till 09/05.

ASSISTANT: Sorry, I couldn't found flights by your requested dates.

USER: That's ok. Thank you for your information.

ASSISTANT: You are welcome, thanks for reaching us.