You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I want to change my existing reservation due to some health issues. Can you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Cynthia Hall here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, we couldn't find any reservation against your name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us, have a great day.