You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Owing an emergence, I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, I will help you with. To change your reservation I want your name, may I know your good name?

USER: My name is Anna King.

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, no issues. Thanks for the help.

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