You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: My plans to visit Dallas has shifted to other day, so I would like to cancel my recent reservation.

ASSISTANT: Sure, may I know your name to check your reservation status.

USER: My name is Ronald Rodriguez.

ASSISTANT: Sorry Ronald, we don't any reservation under your name.

USER: Ok, no issues.

ASSISTANT: Do you want to ask us anything else?

USER: No, thank you for your quick response.

ASSISTANT: Ok, thank you for reaching us, have a nice day.