You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: As my tournament got rescheduled, can you help me to change my existing reservation?

ASSISTANT: Sure, may I know your good name?

USER: Yes, my name is Donna Anderson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there no any reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you, have a nice day.