You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you please change my existing reservation? Because I booked a direct flight instead of connecting flight.

ASSISTANT: Sure, I can help you with that. Can I have your name to check your details in reservation list?

USER: Ok, I am Matthew Garcia.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Matthew Garcia, we didn't found any reservation on your name to change.

USER: Ok, Thanks for information.

ASSISTANT: Thank you for reaching us.