You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Daniel Gonzalez.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: There is no reservation found on your name in our database to change.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.