You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me to book a flight ticket with the name Betty Roberts and make sure that the price limit should be with in 500.

ASSISTANT: Ok, please provide your journey dates?

USER: I will start on 08/21 and I intend to return on 08/23.

ASSISTANT: Can you give your origin and destination airport codes?

USER: My origin airport will be NY-EWR and destination is FL-MCO.

ASSISTANT: Ok, give me a moment, I will revert you.

USER: Sure.

ASSISTANT: Thank you. Sorry, we could not found any flights for you.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for picking our agency.