You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid you today?

USER: Please change my existing reservation.

ASSISTANT: Sure, can you please provide your name?

USER: I am Ashley Taylor.

ASSISTANT: Please wait for a while, I will check the reservation list and revert to you.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Thanks.

ASSISTANT: Thank you for reaching us.