You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Kimberly Lewis. I would like to change my reservation, could you help me out?

ASSISTANT: Sure, please give me a moment to check the details.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: That's ok. Thank you.

ASSISTANT: Most welcome.