You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donna Walker here.

ASSISTANT: How may I guide you Donna?

USER: I was booked a flight ticket earlier in this week.Due to heavy rainfall, I would like to cancel my reservation. Can you please help me for cancelling the reservation?

ASSISTANT: Sure, I will help you on that. Please wait a moment to check your previous reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry Donna, we regret that, there is no reservation found under your name in our records.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for using our services, have a great day.

USER: Welcome, have a good day.