You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you?

USER: I am Kenneth Collins, Owing to an emergency I want to change my existing reservation. Can you please help me with that?

ASSISTANT: Please wait a moment, I will check and back to you.

USER: Ok.

ASSISTANT: Unfortunately, no reservation found on your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your information.