You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Samantha Johnson, I need help to change my reservation to as my friend postponed our meeting.

ASSISTANT: Sure, I am here to help you. Please give me a minute I will get back to you.

USER: Sure.

ASSISTANT: Thank you, sorry no reservation found with your name.

USER: Thank you for the details.

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