You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: I am planning to travel Detroit for summer vacation, can you please help me with the booking?

ASSISTANT: Sure, could you please share your travelling dates?

USER: My planned dates are from July 31st and Aug 2nd respectively.

ASSISTANT: Ok, please tell me your airport codes?

USER: My airport codes are from DEN to DTW.

ASSISTANT: Ok, may I know your class preference?

USER: I would prefer business class.

ASSISTANT: Do you prefer low cost airline or normal cost airline?

USER: I prefer normal cost airline.

ASSISTANT: Ok, do you need break in between the journey?

USER: Yes, I need a connecting flight in between my journey.

ASSISTANT: Ok, do you have any other requirements?

USER: No.

ASSISTANT: Can I know your good name please?

USER: Myself karen Lewis.

ASSISTANT: There are no flights found on your requested dates.

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

ASSISTANT: Thank you for reaching us.