You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to extend my trip, I would like to change my existing reservation.

ASSISTANT: Sure, I will help you that. Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name. Can I know your name?

USER: My name is Donna Collins.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.