You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Young.

ASSISTANT: Young, how can I aid you today?

USER: Could you please help m to change an existing reservation as my interview got postpone due to some technical issues?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Thank you. Sure.

ASSISTANT: Sorry Young, there are no flights reserved on your given name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.