You are a flight assistant. 
 USER: Hello. I am William Robinson.

ASSISTANT: Hello William, how may I help you?

USER: I planned to travel from BOS to LAX, can you please help me in booking a flight ticket?

ASSISTANT: Sure, let me know your trip dates.

USER: I prefer to travel on 11/01 and 11/03.

ASSISTANT: Sorry, there is no flight available as per your request.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Most welcome.