You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you aid me to book a ticket from PHX to LAS?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are Apr 17 and Apr 19 respectively.

ASSISTANT: Do you prefer a connecting flight or direct flight?

USER: I prefer for single connecting flight and I used to travel in business class.

ASSISTANT: Do you have any other preferences?

USER: No other preferences.

ASSISTANT: Can I know your name?

USER: Samantha Edwards here.

ASSISTANT: Sorry, there are no flights available on your request.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.