You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: My name is Amy Lee, I want to change my reservation due to some reason my trip is postponed. Can you help me with that?

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name in the database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.