You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my reservation as my trip is postponed. Can you change my reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: My name is Samantha White.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.