You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Gary Scott.

ASSISTANT: How can I help you today?

USER: I want to change my existing reservation as my meeting with the client got postponed, can you please help?

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: No worries, thank you anyway.

ASSISTANT: Thank you for opting us.