You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Hernandez.

ASSISTANT: How can I aid you at this moment?

USER: I want to change my reservation as my plan to go for an adventure trip got postponed. Can you help me?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to say, there is no active reservation have been found under your name in our database to amend it.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.