You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Green here.

ASSISTANT: How can I assist you?

USER: I have to attend my business meeting, so please book my ticket from DTW to SFO.

ASSISTANT: Ok, may I know your travelling dates?

USER: My itinerary dates are Oct 29 and Oct 31.

ASSISTANT: Do you have any class limit?

USER: I prefer business class.

ASSISTANT: Ok, do you have any airline preference?

USER: No, I need a connecting flight.

ASSISTANT: Ok, please wait.

USER: I want to depart from Detroit in the evening.

ASSISTANT: Sorry to inform this, no flights are available on your travel dates.

USER: No problem, thank you.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.