You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid 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 will help you with that. May I know your name for further process?

USER: I am Melissa Lee.

ASSISTANT: Please wait a moment, I will check your reservation status.

USER: Ok, I will wait.

ASSISTANT: There is no previous reservation available in your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you contacting us.