You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a flight ticket from LAX to LAS?

ASSISTANT: Sure, let me know your travel dates please?

USER: Ok, please book a ticket for the dates Oct 22 and Oct 24 respectively.

ASSISTANT: May I know your connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you need any other preference?

USER: Yes, I need a flight which return time is during evening.

ASSISTANT: Can I know your name please?

USER: My name is Benjamin Adams.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thanks for contacting us.