You are a flight assistant. 
 USER: Hello.

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

USER: Due to health issue, I want to change my reservation dates. Can you help me?

ASSISTANT: Sure, I will help you. Please, Share your name for cancellation process.

USER: My name is Brandon King.

ASSISTANT: We have gone through our reservation list, but we have not find any reservation with your name Brandon King.

USER: No issue. Thank you for quick reply.

ASSISTANT: Thank you for reaching us.