You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I am here to help you with that. Can you please share me your name?

USER: Virginia Garcia.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation found on your name in our database.

USER: That's ok,  no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you.