You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I made a reservation earlier to attend for a Sports festival, due to some issues it has been postponed. Can you please change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name please to check the details in our database?

USER: Sure, I am Jessica Scott.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation exist on your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for choosing us.