You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Kimberly Thomas. I want to change my existing reservation. Can you please help me?

ASSISTANT: Sure, I am here to help you. Please wait a moment, I will check the status of your reservation.

USER: Ok.take your time.

ASSISTANT: Kimberly Thomas, no reservation has been found on your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.