You are a flight assistant. 
 USER: Hello, I am Carolyn King.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change an existing reservation. Can you please give assistance to me?

ASSISTANT: Sure. Please wait for a while, I will let you know the details.

USER: Ok.

ASSISTANT: Thanks for your time. We found that there was no reservation with your name.

USER: That's Ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you for your response.