You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my reservation which is under my name. Can you please help me with that?

ASSISTANT: May I know your name please ?

USER: My name is David Miller.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.