You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brenda Gonzalez.

ASSISTANT: How can I support you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.

ASSISTANT: Sure, I am here to help you, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Brenda Gonzalez, no reservation found on your name.

USER: it's Ok, thanks for your response.

ASSISTANT: Thank you for approaching us.