You are a flight assistant. 
 USER: Hi, Kenneth Lewis here.

ASSISTANT: Hello Lewis. How can I aid you?

USER: I would like to change my reservation, which I have done previously, due to the climate I have to change my reservation. Can you help me?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Sorry Lewis, there is no reservation registered on your name.

USER: It's ok, no issues. Thank you for checking.

ASSISTANT: You are welcome.