You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: May I know your journey dates?

USER: My travelling dates are Nov 10 to Nov 12.

ASSISTANT: Is there any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Do you have any other requirements?

USER: I want to depart in the evening.

ASSISTANT: May I know your name?

USER: Brain Edwards.

ASSISTANT: There is no flight found with your required dates to travel.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.