You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Hall.

ASSISTANT: How may I guide you for the day?

USER: I am planning to book a ticket from DCA to DTW. Can you please help me out?

ASSISTANT: Sure, we are here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your planned travel dates?

USER: I would like to travel on Aug 8 and return back on Aug 10.

ASSISTANT: D you have any other preferences?

USER: Yes, I am looking for a direct flight.

ASSISTANT: Frontier airline are providing a Single connection limit with a fare of 100. Shall I proceed?

USER: I need a direct flight, can you check it.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: There are no flights as per your requirements.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching our agency, have a safe journey.