You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you out? May I know your good name?please.

USER: I am Mathew Lewis.

ASSISTANT: Thank you for providing your name.

USER: I want to attend my friend engagement ceremony on 01/06 at Chicago,IL-ORD.

ASSISTANT: Ok.

USER: I will depart to Oakland,CA-OAK on 01/08.

ASSISTANT: Ok, please wait a minute, I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, but no flights available on travel days. Wait a minute. I will check, with price limit and connection limit,. please provide connection and price limit.

USER: I have a price limit of 5000 with a single connection.

ASSISTANT: Ok, thank you, unfortunately no flights available on your requirements.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us.