You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Myself Donald Green. I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Thank you for accepting my request, I will wait for your response.

ASSISTANT: Sorry, there was no reservation found with your given name.

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

ASSISTANT: Thank you for opting us.