You are a flight assistant. 
 USER: Hi.

ASSISTANT: Please let me know, what kind of service your looking for?

USER: Due to some health issues, I need to change my reservation, can you please help me with this?

ASSISTANT: Sure, please share me your good name.

USER: Sure, I am Jeffrey Rodriguez.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.