You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I assist you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Anna Scott.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: No problem, thank you for the checking.

ASSISTANT: Thank you for opting us.