You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can serve you at this moment?

USER: Timothy Evans here.

ASSISTANT: Good evening Evans.

USER: Good Evening. Actually, my leaves are extended. So, I need to change my reservation. Can you help me out?

ASSISTANT: Sure, I will help you with changing your reservation.

USER: Thank you.

ASSISTANT: Please be hold on for a while, let me check for existence of your reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting with patience. Sorry Evans, I did not came across your name in the reservation list to change your reservation.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: My pleasure. Thank you for opting us.