You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your good name?

USER: Sure, my name is Betty Hernandez.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for choosing us.