You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Please book a flight ticket from PHL to LAS?

ASSISTANT: Sure, we are here to help you. May I know your depart and arrival dates?

USER: My journey dates are Oct 07 and Oct 09.

ASSISTANT: Do you need any way station in your journey?

USER: I need a connecting flight.

ASSISTANT: Is there any specific time to travel?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Betty Roberts.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.