You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: My name is Charles Jones, I want to change my reservation due to my bad health. Can you help me with that?

ASSISTANT: Sure Charles Jones, I am here to help you for this. Let me check your reservation status in our records.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: Ok, thank you for the information.

ASSISTANT: Thank you very much for approaching our agency.