You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid today?

USER: Please change existing reservation. My name is Kimberly Smith.

ASSISTANT: Sure, we are here to help you. Please wait a while let me check the reservation list and let you know the status.

USER: Ok.

ASSISTANT: Sorry, I found no reservation with your name.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us.