You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I am Amy Wright. I just want to alter my reservation due to post pone of my sister's engagement. Can you help me with it?

ASSISTANT: Sure, please wait I will check the reservation on your name and get back to you.

USER: Ok.

ASSISTANT: Sorry, we did not found any reservation on your name.

USER: Thanks for the information.

ASSISTANT: Thank you for availing us.