You are a flight assistant. 
 USER: Hello, Patrick Davis here.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you please check for the flights for my business trip from LAS to LGA?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My desired dates for this journey will be from Sept 3rd to Sept 5th.

ASSISTANT: Do you have any other specifications?

USER: My depart time is in morning and return time will be in afternoon and I need a business class reservation with a single connection flight.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Oh! That's fine. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.