You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: Please change my existing reservation owing to an emergency.

ASSISTANT: In what way shall I guide you now? On whose name the reservation is registered?

USER: I am Ruth Nelson.

ASSISTANT: Thanks for your name. Wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. Sorry, there was no reservation on your name to change.

USER: Thank you.

ASSISTANT: Thank you for opting us.