You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Rebecca Rodriguez. I want to change my existing reservation as my interview got rescheduled. Please help me out.

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform that, there is no reservation found on your given name.

USER: No issues, thank you.

ASSISTANT: Thanks for reaching us, have a nice day.