You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I guide you today?

USER: I am Emily Robinson, I want to change my reservation as my plan to meet my client is postponed. Can you change my reservation?

ASSISTANT: Sure, I am here to serve you. Please be on hold, meanwhile I will check your reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no active reservation found with your name, to change it.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for your presence.