You are a flight assistant. 
 USER: Hi, I am Larry Lopez.

ASSISTANT: Hello, May I know, how can I best assist you now?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.