You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Matthew Brown here.

ASSISTANT: How can I help you?

USER: I am looking for a flight with price below 500. Can you book it?

ASSISTANT: Sure, I will. May I know your travel dates please?

USER: My airport codes for boarding the flight are JFK to EWR. My travelling dates for journey are 02/09 to 02/11.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: As per your details, there are no flights found on those given dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.