You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Linda Smith.

ASSISTANT: How can I assist you?

USER: I would like to change my recent reservation because my trip dates are postponed.

ASSISTANT: Sure Linda, please wait a moment.

USER: Ok, take your own time.

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

USER: It's ok, thank you for giving information.

ASSISTANT: Thank you for approaching us.