You are a flight assistant. 
 USER: Hello, myself Mary Perez.

ASSISTANT: Hello. How can I aid you today?

USER: I want to change my departure and arrival day in my existing reservation, can you please help me out?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your previous reservation status. There is no previous reservation found in your name.

USER: Ok, I will wait for your response. It's ok, thank you for the information.

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