You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: Could you book my ticket from PHL to LAX?

ASSISTANT: Could you please share your travelling dates?

USER: My trip dates are Aug 13 and 15.

ASSISTANT: Do you need a lay by in between the journey?

USER: I need single stopover in my journey.

ASSISTANT: Do you prefer business or economy class?

USER: I have no other requirements in my journey.

ASSISTANT: May I know your good name please?

USER: Amy Thompson here.

ASSISTANT: There are no flights found on your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.