You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: My mother health is too bad, so I need to change an existing reservation.

ASSISTANT: Sure, can I have your name to proceed further?

USER: My name is Samantha Evans.

ASSISTANT: Sure, let me check and let you know. Sorry, no reservation found with provided name.

USER: That's not a problem, thank you.

ASSISTANT: You are welcome, thanks for your interest.