You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I would like to change an existing reservation due to some issues, can you please help me?

ASSISTANT: Ok, I am here to help you with that. Can I know your good name?

USER: Thank you.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, my name is Katherine Phillips. Sure, I will wait.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for approaching us.