You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you today?

USER: I want to change my existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, I am here to help you. May I know your good name?

USER: Sure, my name is Frank Hall here.

ASSISTANT: Ok, please wait for a few minutes.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, no reservation was found on your name to change.

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

ASSISTANT: Thank you for choosing us.