You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I render you today?

USER: I am Katherine Perez. I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name in our data base.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching us.