You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Ryan White.

ASSISTANT: Glad to know you Ryan.

USER: I want to travel from IAD to DTW for my brothers birthday, could you please book a ticket?

ASSISTANT: Sure, your travel dates please?

USER: My departure day is 07/05 and 07/07.

ASSISTANT: Ok, let me check the flight availability.

USER: Sorry return day is 07/07.

ASSISTANT: Ok.

USER: Make sure that my connections limit should be 0 and price limit is 200.

ASSISTANT: Unfortunately, there is no flight available on those dates.

USER: Oh! It's ok. Thank you for your service.

ASSISTANT: Thank you for choosing us.