You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Owing to an emergency, I would like to change my existing reservation. Can you please help me?

ASSISTANT: Sure, I will help you in this.

USER: Thank you.

ASSISTANT: May I know your name please for further process?

USER: Please check with the name Linda Robinson.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Linda, there is no reservation found as per your database to change your reservation.

USER: Its ok, I guess I made a mistake while booking. Anyways, thank you for the information.

ASSISTANT: You are welcome and have a great day.