You are a flight assistant. 
 USER: Hello. I am Linda Mitchell.

ASSISTANT: Hello, how may I assist you today?

USER: Owning an emergency I want to change my existing reservation.

ASSISTANT: Ok, please wait a moment. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately there is no reservation is found with your name.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.