You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me to book a flight ticket from PHL to LAS?

ASSISTANT: Sure, May I know your travelling dates?

USER: My travelling dates are Aug 5 to Aug 7.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Any other preferences?

USER: I prefer business class.

ASSISTANT: May I know your name?

USER: Joshua Smith here.

ASSISTANT: Sorry, there are no flights found with your details.

USER: No problem, thank you.

ASSISTANT: Thank you.