You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I want to change my recent reservation as I have changed my tour dates, help me in changing my recent reservation.

ASSISTANT: Sure, May I know your name?

USER: I am Sandra Baker.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.