You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I help you today?

USER: I would like to travel to IAD for my business trip, can you please reserve flight ticket from DTW?

ASSISTANT: Sure, please help me with your travelling dates?

USER: Sure, my planned travelling dates are Mar, 20 and 22 respectively.

ASSISTANT: Do you have any connection limit?

USER: I would be comfortable with single connection.

ASSISTANT: Can I have your name please?

USER: Scott Edwards here.

ASSISTANT: Any other preferences?

USER: Yes, I have to return at afternoon and I used to prefer normal cost airline.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for opting us.