You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Kimberly Collins, I need your help in changing my existing reservation.

ASSISTANT: Give me moment to check is there any reservation and get you back.

USER: OK.

ASSISTANT: There is no reservation on your name to change the reservation.

USER: It's OK.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.