You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in booking a flight ticket from BOS to LAX?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from Jan 31st to Feb 2nd.

ASSISTANT: May I know your name?

USER: I am Shirley Clark.

ASSISTANT: Do you have any specifications?

USER: Yes, I want to return in the afternoon. I want a break in between my journey.

ASSISTANT: Sorry, there is no flight at this moment.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.