You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I provide assistance for you?

USER: Owing to have an emergency, I would like to change my reservation.

ASSISTANT: Ok.

USER: Aid me in  changing the reservation.

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

USER: My reservation was done with the name of Elizabeth Hernandez.

ASSISTANT: Please, stay online. I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: Thank you for your valuable time.

USER: Fine.

ASSISTANT: We are sorry to inform you that, no reservation was found on your name.

USER: Ok. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a good day.