You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Frank wright. Can you change my existing reservation?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: We did not find any reservation on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.