You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to go for a small vacation to SFO. Can you please aid me for booking from LAS?

ASSISTANT: Sure, when are you planning to start and return on?

USER: I am planning to depart on April 16 and return on April 18.

ASSISTANT: Do you need a connecting flight?

USER: I need a connected flight.

ASSISTANT: Can I know your good name?

USER: Sure, my name is Dorothy Rodriguez.

ASSISTANT: There are no flights found with the given details.

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

ASSISTANT: Thank you.