You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I am Jonathan Gonzalez. I want to change my existing reservation as my friend's bachelor party got postponed.

ASSISTANT: Sure, can you hold on for a while, I will check and get back to you.

USER: OK.

ASSISTANT: Thanks for waiting,. We are sorry to say you that we have not found any reservation on your name.

USER: OK, thank you for the information.

ASSISTANT: Thank you, does anything else that I can help you with?

USER: No, thank you.

ASSISTANT: OK, Thank you for connecting with us, have a great day.