You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to change my reservation because my trip has been postponed, can you assist me?

ASSISTANT: Sure, may I know your name?

USER: Pamela Martin.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you.