You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Stephen Perez. I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, please wait a moment, let me check with your details in our database.

USER: Ok, thank you.

ASSISTANT: Sorry, there are no active reservations found on your given name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching our service.