You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book a flight ticket from JFK to LAS to attend a meeting in Las Vegas?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: My journey dates are on Sept 15th and 17th.

ASSISTANT: Do you have any connection limit?

USER: I prefer a flight with single connection.

ASSISTANT: Is there any other specifications in your journey?

USER: I prefer economy class in my journey.

ASSISTANT: May I know your name?

USER: My name is Gregory Walker.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.