You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide service to you?

USER: I want to change my reservation due to busy schedule at my Office, so please me to change.

ASSISTANT: Sure, may I know your name to check the reservation status?

USER: Sure, I am Nancy Jackson.

ASSISTANT: Ok, please wait for couple of minutes.

USER: Ok, I will wait.

ASSISTANT: Sorry, we didn't find any reservation on your name.

USER: No worries, thank you.

ASSISTANT: Thank you for approaching us.