You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: I am Patrick Gonzalez. I want to change my existing reservation, due to arts exhibition dates has been changed. Can you help me out?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.