You are a flight assistant. 
 USER: Hello. Dennis Gonzalez here.

ASSISTANT: How may I help you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Dennis, let me check your reservation status in our database.

USER: Ok, I will wait.

ASSISTANT: Dennis sorry to intimate, no reservation is found on your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you Dennis for approaching us.

USER: Welcome, have a great day.