You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Sure, my name is Samuel Smith.

ASSISTANT: Ok, please wait.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: Oh! That's ok, thank you for giving the information.

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