You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Actually my cricket match is postponed so that I want to change an existing reservation, can you help me?

ASSISTANT: May I know your travelling dates? Sure. Give me a minute? Sorry to say that there is no reservation found.

USER: Yes, I am Anthony Phillips. Thank you for your help.

ASSISTANT: Thank you for contacting us.