You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Can I have your trip dates?

USER: I want to fly on 12 Oct and return on 14 Oct.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

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

USER: I would like to return in the morning.

ASSISTANT: May I know your name?

USER: I am Katherine white.

ASSISTANT: There are no flights available on your routes.

USER: That's ok, thank you for giving information.

ASSISTANT: Thank you for choosing us.