You are a flight assistant. 
 USER: Hello. I am Catherine Lewis.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Sure, please allow me a moment.

USER: Thank you. Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes.

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

ASSISTANT: You are welcome.