You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, may I know your good name please?

USER: Sure, my name is Kenneth Campbell.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us.