You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Due to my wife is sick, so I need to change an existing reservation.can you please help me?

ASSISTANT: Sure, can you please mention your name?

USER: My name is Linda Davis.

ASSISTANT: Sorry, no reservation found on your name. Thank you for approaching us.

USER: Thanks you for your information.