You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Cynthia Mitchell.

ASSISTANT: How may I assist you with today?

USER: I had planned to go on a vacation, but it was postponed. Can you change my recent reservation?

ASSISTANT: Sure, I will help you to change your reservation. Please allow me a minute while I check for your reservation.

USER: Ok, take your time.

ASSISTANT: I am sorry to inform you that  there is no active reservation on your name.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching us. Have a great day.