You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Collins.

ASSISTANT: How can I amend you?

USER: I want to cancel my recent reservation due to rainfall my examination dates has been cancelled.

ASSISTANT: Ok.

USER: Can you please help me with cancellation?

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is a reservation found on your name. Shall I cancel?

USER: Ok, proceed.

ASSISTANT: Your reservation has been cancelled.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.