You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation in the name of Amanda Moore. Can you help me in this?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for opting us.