You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to do some changes in my existing reservation. Can you aid me in amending my existing reservation?

ASSISTANT: Sure, May I know your name?

USER: Ticket was reserved on the name Frank Gonzalez.

ASSISTANT: Please wait a second.

USER: Take your time.

ASSISTANT: Sorry, No reservation found on your name.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.