You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to change my departure day in my existing reservation, can you please help me out?

ASSISTANT: It's my pleasure to help you with your concern. May I know your name to check with the status of your reservation?

USER: Nice to hear that. My good name is Brian White.

ASSISTANT: Thank you for providing your name. May I request you to please wait for a moment?

USER: Yes, please take your own time.

ASSISTANT: Thank you for waiting. Brian White, regret to inform that there is no active reservation found in our database.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.