You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Elizabeth Wright. I would like to book a flight ticket from DCA to DTW, can you please help me to book a flight ticket?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: Sure, my desired travel dates are May 26 and May 28.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specifications?

USER: My return time is evening.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.