You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Kevin Adams.

ASSISTANT: In which way I can assist you at this moment?

USER: I want to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation status.

USER: Sure, I will wait for your response.

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

USER: That's ok, no problem. Thank you for the information.

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