You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I want to go to my grandmother memorial service at Oakland,CA - OAK, Can you please help me in booking?

ASSISTANT: Sure, May I know the source code?

USER: Sure, my source is Orlando, FL - MCO.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are on 03/27 to 03/29.

ASSISTANT: May I know your name?

USER: Sure, I am Samuel Nelson.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your selected dates.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for choosing us.