You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me in booking a flight ticket from PHL to LAS?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I want to fly on Apr 27 and return on Apr 29.

ASSISTANT: May I know your connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the evening time.

ASSISTANT: May I know your good name?

USER: Eric Williams.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.