You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Stephen Davis.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure, I will wait.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: That's ok. Thanks for your time.

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

USER: You are welcome.