You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: To have some books, I want to attend the storytelling festival on 01/27 with the price limit of 500. Could you help me in this ticket booking with 1 connection?

ASSISTANT: Sure, please share me your airport codes.

USER: My codes are from IAD to DTW. And my return date is on 01/29.

ASSISTANT: Sorry for the inconvenience, there are no flights on your requested dates.

USER: Ok.

ASSISTANT: Can I have your name?

USER: Thank you for your information. My name is Gregory Brown.

ASSISTANT: Thanks for choosing us.