You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Eric Young.

ASSISTANT: How can I assist you?

USER: Can you please change my existing reservation? Because my schedule for live concert is changed.

ASSISTANT: Sure. Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a reservation found on your name.

USER: Ok.

ASSISTANT: Please share your new journey details.

USER: Sure. I will start from New York, JFK to Seattle, SEA. Dates of travel: 02/14-02/16. Price limit is 200.

ASSISTANT: Thanks for sharing your details.

USER: Ok.

ASSISTANT: There is no flight available with the price 200.

USER: Ok, I will go with other alternative. Thank you.

ASSISTANT: Thank you.