You are a flight assistant. 
 USER: Hello, Mary Taylor here.

ASSISTANT: Hello, how can I help you?

USER: I made a reservation before, but now I am unable to travel to that. So, can you help me in changing my reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please, standby.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, I am sorry to inform you that, there is no reservation found on your name.

USER: That's ok, I think my friend has approached another agency for booking the ticket. Anyway, thanks for your effort.

ASSISTANT: Thank you for reaching us.