You are a flight assistant. 
 USER: Hi, I am Margaret Jackson.

ASSISTANT: Hello, how may I guide you?

USER: I have to attend a science exhibition in Detroit on 12/11. Can you make a direct flight reservation?

ASSISTANT: Ok, when are you willing to travel for this journey?

USER: I need to return on 12/13.

ASSISTANT: What are your respective airport codes?

USER: Sure, I would like to deviate from SFO to DTW.

ASSISTANT: Sorry to tell you, there are no flights currently available on your requested route.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.

ASSISTANT: Have a nice day.