You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Charles Gonzalez. Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, let me check the current status and revert you.

USER: Ok, take your own time.

ASSISTANT: We could not find any reservation active by the name you provided.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for approaching us.