You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, can I know your name please?

USER: Yes, I am Jason Martinez.

ASSISTANT: Sorry, there is no reservation found on your requested name Jason. Thank you for communicating us with your query.

USER: Ok, thank you for contacting us. Thank you for your help.

ASSISTANT: Our pleasure to help you.