You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: My name is Jonathan Gonzalez. I am want to make some changes in my existing reservation, can you please help?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Not an issue, thank you for your valuable time.

ASSISTANT: Thank you for reaching our service.