You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: I am happy to help you, may I know your name to check your reservation?

USER: Sure, I am Jeffrey Brown.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, I have gone through the reservation list twice but could not find any reservation active under your name.

USER: No issues, thank you for your time.

ASSISTANT: Welcome, have a good day.