You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to change my reservation to next week?

ASSISTANT: Sure, I will help you to change your reservation. Please mention your name.

USER: Sure, my name is Karen Carter.

ASSISTANT: Please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: No issues, thank you for your time.

ASSISTANT: Welcome, have a nice day.