You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you for the day?

USER: In Washington, DC - IAD I planned to celebrate my sister birthday on 11/26. Can you book a flight ticket?

ASSISTANT: Sure. May I know your travel dates and airport codes, Please? May I know your good name, Please?

USER: I will start from Detroit, MI - DTW and I will return on 11/28. My name is Katherine King.

ASSISTANT: OK. May I know, Do you have any other restrictions to be met?

USER: I need one connection with fare of 500.

ASSISTANT: Sorry to inform you that, We do not have flights which met your requirements.

USER: Ok, no issue. I will find another option.

ASSISTANT: Thank you, For choosing us for making an inquiry to book a ticket.

USER: Thanks for your information.

ASSISTANT: Have a great day.