You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Cynthia Martinez. I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure, let me check the status and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, we could not find any reservation by the name you mentioned above.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.