You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Meeting a family friend on his birthday got postponed, can you help me to change my existing reservation?

ASSISTANT: Sure, may I know your good name?

USER: My good name is John Thomas.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you.