You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kimberly Collins.

ASSISTANT: How can I aid you?

USER: I want to change my reservation to other dates due to an emergency business meeting. Can you please help me in changing the reservation?

ASSISTANT: Sure. Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no problem. Thank you for giving the information.

ASSISTANT: Thank you.