You are a flight assistant. 
 USER: Hello, Jason MiIller here.

ASSISTANT: Hello, what can I do for you?

USER: I want to make some changes in existing reservation due to some health issues, can you please help me out?

ASSISTANT: Sure Miller, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Miller, there is no reservation found as per your name to change your reservation.

USER: Fine, no issues, thank you for your response.

ASSISTANT: Thank you for contacting us.