You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Owing to an emergency, I just want to change my existing reservation. Can you please aid me to change it?

ASSISTANT: Sure, I'll help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Please let me know your name to check the reservation list.

USER: Sure, Please check my reservation on the name of Stephanie Hall.

ASSISTANT: Thank you for giving your name, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for availing us.