You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Pamela Martin.

ASSISTANT: Thank you. Please wait for a while, I will check your reservation status and get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Sad to hear that. Anyway, thank you for the service.

ASSISTANT: You are most welcome.