You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Samuel Jackson. Can you please help me in booing my flight ticket from LAS to SFO?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My trip dates are 12/20 and 12/22. Please search a direct flight.

ASSISTANT: Wait a moment please. Andrew Perez, there are no flights available in your route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.