You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My friend met with the accident, so our plan to visit Dallas has postponed.

ASSISTANT: Ok.

USER: I need your help in cancelling the recent reservation.

ASSISTANT: Sure, I will help you. No reservation found for this search.

USER: My name is John Phillips.

ASSISTANT: Sorry.

USER: Ok, no issues. Thank you for your help.

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