You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Betty Adams. Actually my final examination is postponed, so I need to change my existing reservation. Can you please help me?

ASSISTANT: Yes, I can help you. Sorry to inform you that there is no reservation found on your name.

USER: No problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.