You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Karen Gonzalez. I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.