You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: I am planning to change my reservation , can you help me in that?

ASSISTANT: Sure, I will help you with your request. Can you please provide your name to check it?

USER: I am John Rodriguez.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: We regret to tell you that, there is no reservation found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us, hope you have a great day.