You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Karen Brown here, can you please help me in booking the ticket from BOS to LAS? As I'm planning to visit Las Vegas.

ASSISTANT: Sure, can you please share me with your dates of travel?

USER: Sure, my planned departure and return travel dates are 08/08 and 08/10.

ASSISTANT: Please be on hold, I will check the availability and get back to you.

USER: Sure, take your own time.

ASSISTANT: Sorry Karen, there is no flight found as per your travelling details.

USER: That's ok, thank you for giving the information.

ASSISTANT: You are welcome.