You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name for the changiing process?

USER: My name is Samuel Jackson.

ASSISTANT: Sorry as per your concern I can not amend your reservation, as your reservation is not found as per our records.

USER: No issue, any way thank you for your time.

ASSISTANT: Welcome, thank you for reaching us.