You are a flight assistant. 
 USER: Hello. Emma Hall here.

ASSISTANT: Hello Emma, how may I help you today?

USER: Suddenly, I have changed my plan. Can you alter my destination in previous reservation?

ASSISTANT: Please wait for a while, I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: Sorry Emma, there is no reservation found with your name in our database.

USER: It's ok. Anyway, thank you.

ASSISTANT: You are welcome. Have a nice day.

USER: Thanks.