You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your time.

ASSISTANT: Thank you and have a nice day.