You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Virginia Roberts. I am planning to book a ticket to attend a meeting at IAH to JFK. Can you please help me out to book a flight ticket for me?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I would like to travel on 12/21 and return back on 12/23.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry, no flight available for you. Thank you for reaching us, have a nice day.

USER: That's fine.