You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: I am Richard Rodriguez.

ASSISTANT: Richard Rodriguez, I have searched the database with your name and I didn't find any active reservation under your name.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.