You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Actually, I want to change my existing reservation because of my interview date has been changed.

ASSISTANT: Ok. Let me check your details. May I know your name?

USER: Sure, my name is Donald Jackson here.

ASSISTANT: No reservation found on your details.

USER: No problem.

ASSISTANT: Sorry for inconvenience.

USER: Thank you for your information.

ASSISTANT: Welcome.