You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My business meeting has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: Sure, my name is Karen Miller.

ASSISTANT: Karen, please give me a moment.

USER: Sure, take your time.

ASSISTANT: Karen, there is no reservation found under your name.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a good day.