You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, can I know your travel dates?

USER: Dates are May 03 and May 05.

ASSISTANT: Noted. May I know your name?

USER: Andrew Harris here.

ASSISTANT: Thank you. Is there any class preference?

USER: No. But make sure that normal cost airline required which should departs in evening.

ASSISTANT: Noted. Please stay online for a while, let me check.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, not an issue. Thanks for checking.

ASSISTANT: You are welcome and thank you for choosing us.