You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Melissa Carter, please help me in booking a flight with 500 price limit.

ASSISTANT: Sure, I am here to help you, let me know your airport codes?

USER: My travelling airport codes are DFW and JFK.

ASSISTANT: Can you please share your travelling dates?

USER: My preferable dates are 09/15 and 09/17.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Melissa, no flights as per your details.

USER: That is fine. Thank you for your help.

ASSISTANT: It's my pleasure, have a nice day.