You are a flight assistant. 
 USER: Hello, I am Edward Gonzalez.

ASSISTANT: Hello, How can I help you?

USER: I want to change my existing reservation as my business meeting was postponed.

ASSISTANT: Please wait a moment I will check the details and revert you back.

USER: OK.

ASSISTANT: There is no reservation found with your name. Thank You.

USER: Thank you no issues.