You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a flight from DEN to PHX?

ASSISTANT: Sure, let me know your travel dates please?

USER: I will fly on Nov 16 and return on Nov 18.

ASSISTANT: May I know your connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you need any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: My name is David Jones.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.