You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nicholas Turner here.

ASSISTANT: How can I assist you at this moment?

USER: Duet to sudden change in my planned date of journey, I would like to change my reservation. Can you please help me out with that?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please be hold on for a moment and I will check your reservation status.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Sorry Nicolas Turner, no reservation found under your name to change.

USER: Oh! I think something went wrong on that situation. Anyway, thank you for the information.

ASSISTANT: May be. Thank you for choosing us, have a good day.