You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, May I know your name?

USER: My name is John Martinez.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.