You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you at this moment?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: My name is Mark Rodriguez.

ASSISTANT: Ok, please wait for few minutes, let me check with your existing reservation status.

USER: Ok, I will wait.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.