You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please make a reservation with direct flight to attend a meeting in Detroit?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My journey dates are, depart on Jan 9th and return back on Jan 11th.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My airport codes are, SFO to DFW.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I already mentioned above.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I wish  to travel in business class.

ASSISTANT: Can you please provide your name to proceed further?

USER: My name is Alexander Harris. My return time should be in the evening.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.