You are a flight assistant. 
 USER: Hello, I am Mark Scott.

ASSISTANT: Hello. How can I help you?

USER: Due to heavy rainfall my event was postponed. Could you please help me with changing my existing reservation?

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT:  Sorry, no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.