You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My trip dates are Apr 18 and Apr 20 respectively.

ASSISTANT: Do you need break in between your journey?

USER: I prefer for single connecting flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: No other specifications.

ASSISTANT: May I know your good name please?

USER: Gregory Martinez here.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.