You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Good morning. How may I assist you?

USER: My name is Ryan Miller. Due to an emergency, my trip is postponed. Could you help me in cancelling the reservation?

ASSISTANT: Sure. Please wait a minute. Ryan, there is no reservation found with your details.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your time.