You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jerry Wilson.

ASSISTANT: How may I aid you today?

USER: I want to change my recent reservation, due to health issue. Can you help me out?

ASSISTANT: Sure, I am here to aid you.

USER: Ok.

ASSISTANT: No reservation is found to change with your current details.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for choosing us, Have a great day.