You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you for the day?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am blissful to help you. May I know your name?

USER: I have confirmed my ticket with name Eric Perez.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We found a reservation on your name, please share your travel details?

USER: My travel dates are 07/28 and 07/30. My source code is EWR and destination airport code is CLT.

ASSISTANT: May I know your budget limit?

USER: My budget limit is 200.

ASSISTANT: Sorry, we found a flight which does not match your price limit.

USER: Ok, fine thank you.

ASSISTANT: Thank you for availing us.