You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know how can I help you now?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Samantha Harris.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our records.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for reaching us, have a good day.