You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I had done my reservation last week to attend an event in Denver but all of sudden the event date got changed to some other day. So, can you modify my reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you for reacting positive for my request.

ASSISTANT: Can you please tell me your name?

USER: Sure, my name is Lisa Clark.

ASSISTANT: Please wait a moment. Sorry, no reservation found on your name in our database.

USER: Not an issue with that. It might be cancelled by my mother but she did not informed me yet. Anyways thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.