You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Eric Lewis. I would like to change my flight reservation because I have to prepare for my exams. Please help me out.

ASSISTANT: Yes, I can help you. Give me a moment.

USER: Thank you. I will wait for your reply.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.