You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I want to change my reservation as my plan to visit my home is postponed. Can you change my reservation?

ASSISTANT: Sure, we are here to help you. May I know your good name please?

USER: My name is Pamela Lopez.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.