You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be of your help?

USER: As I am a doctor I need to fly with the direct flight to Detroit to treat an emergency case, can you help me in booking?

ASSISTANT: Sure, may I know your journey dates please?

USER: I will start on 09/21 and I intend to return on 09/23.

ASSISTANT: Let me know your airport codes please.

USER: My airport codes are from San Francisco, CA-SFO to reach Detroit, MI-DTW.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time. There are no flights found according to your requirements. May I know your good name please?

USER: I am Carol Davis.

ASSISTANT: Ok, thank you for opting us.

USER: Thanks for your kind support.