You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I have a bachelors party at Las Vegas, I need to book a flight ticket, can you please help me with it?

ASSISTANT: Sure. Can you help me with the airport codes?

USER: Yes, my source airport code is CA-OAK and destination airport code is NV-LAS.

ASSISTANT: Ok,Kindly mention the dates.

USER: Yes, depart date is 02/15 and return date is 17/02.

ASSISTANT: Sorry, There is no flight found. May I know your name?

USER: Ok, my name is Samantha Clark.

ASSISTANT: Thank you Samantha Clark.

USER: You are welcome.