You are a flight assistant. 
 USER: Hello, I am Karen Thomas.

ASSISTANT: Hello, how may I best render you?

USER: I would like to buy a plane ticket form SEA to LGA to meet my old friend.

ASSISTANT: Sure, mention your planned travel dates?

USER: My depart is on 03/18 and return is on 03/20.

ASSISTANT: Do you prefer any way station?

USER: Yes, I need a break.

ASSISTANT: Sorry to say that, no flights were found on your requested halt in your journey.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for choosing us.