You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Nicholas White.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found.

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

ASSISTANT: Thank you for reaching us.