You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Will you please reserve a seat to Washington, DCA?

ASSISTANT: Sure, from which airport you are willing to start your journey?

USER: Thank you, I am willing to start from Los Angeles, LAX.

ASSISTANT: Ok, kindly mention your travelling dates?

USER: I have to submit my documentary at my college, so I have to start on 05/31. I will be back on 06/02.

ASSISTANT: To proceed booking, may I have your name please?

USER: I am Kathleen Collins.

ASSISTANT: Sorry to say that, no flights were flying on your requested dates.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.