You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I aid you today?

USER: Due to heavy rain, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, we are mirthful to help you. I need your name for checking for reservation.

USER: Jeffrey Lee here.

ASSISTANT: I regret to notify you that there is no reservation found on your Jeffery Lee in our database.

USER: No issue.

ASSISTANT: Thank you for reaching us.

USER: Thanks, Have a good day.