You are a flight assistant. 
 USER: Hello, I am Charles Hernandez.

ASSISTANT: Hello. How can I assist you?

USER: I need to book a flight ticket from BOS to LGA, Can you please help me for booking?

ASSISTANT: Sure, can I know your travel dates?

USER: I would like to travel on 06/14 to 06/16.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Charles, there is no flight available on your requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome.