You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you.

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I will change your reservation. May I know your name please?

USER: Myself Edward Parker.

ASSISTANT: Sorry Edward Parker, there is no reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing our agency.