You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need buy a plane ticket from LAX to CLT. Can you help me?

ASSISTANT: Sure, please provide your dates to reserve your seat.

USER: I will start on July 19th and return on July 21st.

ASSISTANT: I need your name to process further.

USER: I am Brian Campbell.

ASSISTANT: Do you need any layovers between your trip?

USER: I need 1 lay by within my route.

ASSISTANT: Do you need any other specifications?

USER: My return time must be in the afternoon.

ASSISTANT: We regret to inform you that there is no flight going on your way.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for contacting us.