You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket from JFK to DEN?

ASSISTANT: Sure, I am here to assist you. Please let me know your travel dates.

USER: I want to fly on Oct 31 and return on Nov 02.

ASSISTANT: May I know your name?

USER: Myself Christine Evans.

ASSISTANT: Thank you. Do you have any specifications?

USER: I need a single connection.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome and thank you for choosing us.