You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you today?

USER: I want to change my existing reservation to next week. Can you help me out?

ASSISTANT: Surely, I will help you out. To check the reservation list, we need your name.

USER: My name is Cynthia Collins.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: Thanks for the information.

ASSISTANT: Thank you for choosing us.