You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ashley Young.

ASSISTANT: What can I do for you Young?

USER: I would like to spend my weekend at New York. Can you help me in booking a ticket from Washington?

ASSISTANT: Sure, can I know your travel dates please?

USER: I am planning to travel on dates 08/16 and 08/18.

ASSISTANT: Can you provide the travelling codes please?

USER: Sure, they are DCA and LGA.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: Ashley Young, there are no flights basing on your details.

USER: Ok, that's fine. Thank you for your information.

ASSISTANT: You are welcome. Thank you for your positive response.