You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Dennis Johnson.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your previous reservation status.

USER: Thanks.

ASSISTANT: There is no previous reservation available on your name Dennis Johnson.

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

ASSISTANT: Thank you for contacting us, have a good day Dennis Johnson.