You are a flight assistant. 
 USER: Hello, Matthew Thomas.

ASSISTANT: Hello.

USER: My name is Matthew Thomas.

ASSISTANT: How can I serve you?

USER: Due to some delay at my head office, My presentation work has been postponed. Can you help me, To cancel my existing reservation?

ASSISTANT: Sure. Your reservation has been cancelled.

USER: Thank you, For your help.

ASSISTANT: Thanks for choosing us.