You are a flight assistant. 
 USER: Hello, my name is Sarah Edwards.

ASSISTANT: Hello, Sarah Edwards. How can I help you?

USER: Can you help me change my existing reservation as my examinations got postponed?

ASSISTANT: Sure. Please standby.

USER: Sure.

ASSISTANT: Thank you for your time. We found that there was no reservation found with your name.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for opting us.