You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I made a reservation earlier for a normal flight unknowingly, actually I need a round trip flight. So, I want to change my reservation. Can you help me in this?

ASSISTANT: Sure, to change your reservation I need your name?

USER: Jack Gonzalez.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: Thanks for the information.

ASSISTANT: Thank you for opting us.