You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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 with that. Can you please share your name?

USER: Samuel Green.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.