You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to book a flight from BOS to LAX?

ASSISTANT: Can I know your travelling dates?

USER: Sure, I want to travel on Mar 29 and need to return on Mar 31.

ASSISTANT: Is there connection preference?

USER: I need a direct flight.

ASSISTANT: Do you have specification?

USER: No.

ASSISTANT: Can I know your name?

USER: Myself Nicholas White.

ASSISTANT: Sorry, there is no flight with your travelling dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you.