You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Can I know your name to check the reservation records to change?

USER: William Parker.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Ok, thank you for waiting. Sorry, there is no reservation been found on your name to change.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing our agency.