You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Matthew Parker.

ASSISTANT: How can I assist you Matthew Parker?

USER: I have to change my reservation as I want to stay for some more days with my mother at Denver, can you please do that for me?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: I have searched the database and I couldn't find any active reservation under your name.

USER: No problem, anyway thank you very much for the information.

ASSISTANT: Thank you for utilising our services.