You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Benjamin Hernandez. I want to change an existing reservation, due to my interview got postponed. Could you help me in changing the reservation?

ASSISTANT: Sure, I am willing to help you. Please stand by.

USER: Sure.

ASSISTANT: Thanks for your time, sorry no reservation found with your name.

USER: Not an issue.

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

USER: Thank you.