You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Emma Martinez.

ASSISTANT: OK.

USER: I would like to cancel my recent reservation, due to sudden changes in the dates of summit which was going to be held in that place. Could you please help me?

ASSISTANT: OK, I can help you. Please wait.

USER: Sure.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thanks for approaching us. have a nice day.

USER: Thank you for your assistance.