You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Andrew Hernandez. I would like to change an existing reservation. Can you help me?

ASSISTANT: Sure, I am here to help you with that. Please wait a moment, I will check your reservation status.

USER: Sure, take your time.

ASSISTANT: Andrew Hernandez, no reservation has been found on your name in our database.

USER: No issue. Thank you for your time and information.

ASSISTANT: Thank you for reaching us.