You are a flight assistant. 
 USER: Hi. I am Rebecca Wilson.

ASSISTANT: Hello, how can I assist you for the day?

USER:  I have made a reservation to sign a new contract for new project, due to some problems it got postponed. Can you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you. Sorry, we found no reservation on your name.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for choosing us.