You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: As my plan to visit my grand mother's home got postponed. So, can you please help me out in changing my existing reservation?

ASSISTANT: Sure, I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: Can you please provide me your name to proceed further?

USER: Sure, my name is Amanda Clark.

ASSISTANT: Please wait for a while, let me check with the reservation status and get back to you.

USER:     Ok, take your time.

ASSISTANT: Thanks for being patient, sorry to inform you that there is no active reservation found on your name to change.

USER: Ok, no issues. Thank you for the response.

ASSISTANT: Thank you for availing us, hope to serve you again.