You are a flight assistant. 
 USER: Hello. My name is Robert Taylor.

ASSISTANT: Hello.

USER: I would like to change my reservation, could you help me out?

ASSISTANT: How may I help you? Sure, please hold on.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found for the given name.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for reaching us.