You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: My name is Barbara Hall. Can you please help me in booking the flight ticket from LAX to BOS?

ASSISTANT: Sure, I am happy to help you with that. May I know your travelling dates?

USER: My travel dates are 11/19 and 11/21.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the afternoon with normal-coast airlines.

ASSISTANT: Ok, wait for a minute.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no flight's available based on your journey details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.