You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you for today?

USER: Kenneth Thomas here. Can you help me to change my reservation to next week? Because my exam is postponed.

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

USER: No issues, thank you for your time.

ASSISTANT: Thank you for contacting us.