You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, may I know your good name?

USER: My name is Anthony Smith.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, there is no active reservation found on your name in the database.

USER: Not a big problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.