You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Nancy Miller here, can you aid me to book a ticket from ATL to DTW?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travel dates are Jan 21 and Jan 23 respectively.

ASSISTANT: Ok, could I have your name please?

USER: Nancy Miller.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: make sure that connection limit is 1.

ASSISTANT: Ok, may I know your class preference?

USER: I prefer to travel in economy class.

ASSISTANT: Sorry, there is flight with your request.

USER: Not an issue, thank you.

ASSISTANT: You are welcome.