You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Kevin Nelson.

ASSISTANT: Kevin Nelson, what can I do for you now?

USER: I would like to book a flight ticket to attend Shenandoah Apple Blossom Festival  in Washington, IAD.

ASSISTANT: Fine. May I have your journey dates?

USER: My journey dates on 05/03 and 05/05.

ASSISTANT: What is your price limit?

USER: Price should be up to 500.

ASSISTANT: Where would you like to start your journey?

USER: My source point is Phoenix, PHX.

ASSISTANT: Thanks for your details.

USER: Ok.

ASSISTANT: Sorry, I did not get any flights for you.

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

ASSISTANT: Thank you.