You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I would like to change my reservation, can you help me out with that?

ASSISTANT: Sure, may I know your name for the changing process?

USER: Sure, my name is Helen Garcia.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: No issues, thank you for your time.

ASSISTANT: Welcome, thank you for reaching us.