You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is Jerry Walker.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found with your given name.

USER: Not an issue, thank you for the service.

ASSISTANT: Thank you for opting us.