You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I am travelling to other place unexpectedly. Can you change my existing reservation? My previous reservation was done with this name Emily Davis.

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

USER: Ok.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

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

USER: Ok,. Thank you for sharing the information.

ASSISTANT: Thank you for reaching us, have a nice day.