You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, we are here to help you. Can you please help me with your journey dates?

USER: My journey dates are June 23rd and 25th.

ASSISTANT: Ok, is there any preference in connection limit?

USER: I prefer to fly with one connection.

ASSISTANT: Ok, let me know your name please.

USER: My name is David Williams.

ASSISTANT: David Williams, we are sorry to inform you that there is no flight available on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.