You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Nicholas Lopez, I need to change my existing reservation. Could you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your reservation status. Sorry to say, no reservation found on your name in my database.

USER: Not a big problem.

ASSISTANT: Ok, thank you for reaching us, have a nice day.

USER: Anyhow thank you very much for your help.