You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my recent reservation as my meeting with my client has been changed, help me in changing my recent reservation.

ASSISTANT: Ok. May I know your name?

USER: I am Linda Smith.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Thant's fine, thank you.

ASSISTANT: Thank you for opting us.