You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Perez.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, will you please give me a moment?

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

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

ASSISTANT: Welcome, have a great day.