You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to do my project work at Oakland, please help me in booking a ticket from IAD to OAK.

ASSISTANT: Sure, please share your journey dates?

USER: My planned journey dates are on Oct 26 and Oct 28.

ASSISTANT: Do you have any specifications?

USER: I would like to depart in the evening and return in the morning.

ASSISTANT: Is there any class preferences?

USER: Any class is comfortable for me.

ASSISTANT: May I know your good name?

USER: My name is Nicholas Smith.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.