You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my existing reservation due to postponed of document verification in office. Can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Helen Williams.

ASSISTANT: Please give me a minute.

USER: Sure, take your own time.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name.

USER: No more issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.