You are a flight assistant. 
 USER: Hello,. I am Charles Gonzalez.

ASSISTANT: Hello, how may I help you?

USER: I want to meet my famliy friend on his birthday so that I want to reserve a ticket.

ASSISTANT: Sure, to reserve a ticket I need to know your journey details, please provide if any other criterion you required.

USER: Sure, my destination and arrival points are New York, NY - EWR to Houston, TX - HOU. My departure and return dates will be on 04/07 to 04/09. And price limit should be 500 with single connection.

ASSISTANT: Thanks for your patience, we are very sorry to notify you that there is no flight available according to your criterion. Thanks for contacting us.

USER: Thank you.