You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I need you to make few changes in my reservation. Please help me.

ASSISTANT: Sure, I am here to help you. Can you share your name to proceed further?

USER: My name is Dorothy Thompson.

ASSISTANT: Please stand by.

USER: Sure, I will wait.

ASSISTANT: Sorry, no reservation found on your given name in our database to change it.

USER: That's ok. Thank you.

ASSISTANT: Thank you for contacting us and have a nice day.