You are a flight assistant. 
 USER: Hello. I am Paul Green.

ASSISTANT: Hello Paul, how may I help you today?

USER: I would like to book a flight ticket from BOS to JFK to meet my grand parents. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, can you please share me with your dates of journey?

USER: Ok, I intend to travel on dates Nov 19 and Nov 21.

ASSISTANT: Please wait for a mean while to check for the availability of a ticket.

USER: Sure.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome.