You are a flight assistant. 
 USER: Hello, myself Stephen Nelson.

ASSISTANT: Hello, how can I help you?

USER: Owing an emergency, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok, no issues. Thanks for your helping hand.

ASSISTANT: Thanks for choosing us.