You are a flight assistant. 
 USER: Hi.

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

USER: I am planning to go for JFK,  I am searching for a flight ticket with my requirements but I did not found any ticket. So can you please book my ticket?

ASSISTANT: Sure, we are here to make your booking in a easy way. May I know your price limit?

USER: My price limit is 500.

ASSISTANT: Kindly, mention your origin airport code.

USER: My origin airport code is ORD.

ASSISTANT: In which dates are you going to travel?

USER: My travel dates are 04/19 and 04/21.

ASSISTANT: May I know your good name for further process?

USER: My name is Lisa Nelson.

ASSISTANT: Thank you for your information, give me a minute.

USER: Ok.

ASSISTANT: Thank you for your valuable time, there is no flight found with your journey locations.

USER: Ok, fine thank you for your information.

ASSISTANT: Thank you for choosing us, have a great day.