You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Raymond Lopez. I need to change my existing reservation, can you please help me?

ASSISTANT: Lopez, I am here to help you. Please wait for a while, I will check your reservation status in our database.

USER: Please take your time.

ASSISTANT: Lopez, I did not find any reservation under your name in our database.

USER: That's fine, thank you for searching flights.

ASSISTANT: You are welcome and thank you for choosing us.