You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Pamela Anderson.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, No issues.

ASSISTANT: Thank you for choosing us.

USER: Thank you.