You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for today?

USER: Myself Mark Nelson. For some issues I want to change my reservation, can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your details in my records. Sorry Mark, there is no reservation found on your name.

USER: It's ok. Thank you for the information?

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