You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: My name is Samuel Lewis, I want to change my reservation as my plan to meet my sister at Boston is postponed. Can you change my reservation?

ASSISTANT: Sure, we are here to help you. Please be on hold for some time.

USER: Sure.

ASSISTANT: Sorry we couldn't find any reservation with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.