You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what kind of help you want from our service?

USER: I am Anthony Lopez here, I want to reserve my ticket from JFK to IAD, can you please help me?

ASSISTANT: Yes, I am here to help you in booking your flight ticket. Could you please let me know your planned dates of your journey?

USER: Thank you. Sure, my preferable dates of journey are from 02/13 to 02/15. Please make sure that the price limit is 200.

ASSISTANT: Sorry Lopez, there are no flights with such a price limit.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: You are most welcome, thank you for reaching out here.