You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am John Rodriguez. As my interview is postponed, I want to change my reservation. Can you help me?

ASSISTANT: Just a moment please.

USER: Ok.

ASSISTANT: I am sorry there is no reservation found on your name.

USER: That's fine, thank you.

ASSISTANT: Thank you for choosing us.