You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How can I help you?

USER: I want to change my existing reservation, as I am not interested to travel now. Can you please help me with this?

ASSISTANT: Sure, I will help you. Please provide me your good name.

USER: I am Melissa Evans.

ASSISTANT: Please wait. I will check your previous reservation.

USER: Ok,.

ASSISTANT: Sorry Evans, I have not find any reservation on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome, have a great day.