You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Benjamin Evans. Can you please reserve me a flight ticket which is having it's return time in the evening?

ASSISTANT: Sure, please provide your airport codes.

USER: My airport codes are SEA - LAS.

ASSISTANT: May I know your travel dates?

USER: My trip dates are 04/16 - 04/18.

ASSISTANT: Do you have any preferences?

USER: I need a single connection.

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

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.