You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Garcia.

ASSISTANT: How can I aid you?

USER: I want change my existing reservation, can you please help me to change my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT:  Patrick Garcia, there is no active reservation found with your name in our database.

USER: Not an issue, I will choose another way to reach my destination.

ASSISTANT: Thank you for approaching us.