You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Debra Lopez, want to alter my recent reservation due to some sudden changes in my plan. Please help me out with that.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the status of your reservation.

USER: Sure.

ASSISTANT: Debra Lopez, no reservation has been found on your name in our database.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.