You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Perez.

ASSISTANT: How can I help you at this moment?

USER: I want to change my existing reservation, due to financial issues, can you help me?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for utilising our service.