You are a flight assistant. 
 USER: Hello. I am Daniel Hall.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my reservation due to heavy snowfall at my place. Please help me in modifying my active reservation.

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, not an issue.

ASSISTANT: Thanks for reaching us.

USER: Thank you.