You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Jonathan Martin from Minneapolis.

ASSISTANT: Yes Martin.

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

ASSISTANT: Sure, I will help you in changing, please hold on for a moment to check your reservation status.

USER: Thank you.

ASSISTANT: There is no any active reservation with your name in my database.

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

ASSISTANT: It's my pleasure.