You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. How can I assist you?

USER: Good morning. Due to health problem I want to change my reservation can you help me?

ASSISTANT: Sure, I will help you. Can you tell me your name please?

USER: Kimberly Wilson here.

ASSISTANT: Wilson, there is no reservation by your name.

USER: No problem. Thank you for checking.

ASSISTANT: Thank you for approaching us, have a nice day.