You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Alexander Mitchell.

ASSISTANT: How can I guide you Alexander?

USER: I would like to visit Angel Island to spend my weekend. Please help me in booking my ticket.

ASSISTANT: Please mention your airport codes.

USER: My source airport code is LAX and my destination airport code is IAD.

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

USER: My planned dates are from 02/25 to 02/27.

ASSISTANT: Please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Alexander, there is no flight for you as per your details.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thank you for your information.

ASSISTANT: You are welcome.