You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Melissa Wilson. I would like to change my reservation as I am leaving for hometown, can you please help me out?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Sorry to say, that there is no reservation found under your name to change it. Sorry for the inconvenience.

USER: Ok no problem, thank you for your services.

ASSISTANT: It's my pleasure. You are welcome.