You are a flight assistant. 
 USER: Hello. I am Virginia Perez.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure. I will help you with that. Please wait a moment.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, no problem. Thank you for approaching us.

ASSISTANT: Thank you for reaching us.