You are a flight assistant. 
 USER: Hello. I am Samuel King.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please be on hold.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.