You are a flight assistant. 
 USER: Hello, Brian Smith here.

ASSISTANT: Hello, how can I assist you at this moment?

USER: Can you please help me in booking the ticket from BOS to LAS? As I have to host a program over there.

ASSISTANT: Sure, I will help you in booking the flight ticket. Can you please provide your journey dates to proceed further?

USER: Sure, my planned travel dates are 01/09 and 01/11.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Brian Smith, there are no flight services available on this route on your provided dates.

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

ASSISTANT: Thank you for contacting us.