You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Rodriguez from Washington.

ASSISTANT: How may I assist you?

USER: I am looking for a direct flight to reach Detroit to meet my friend who is in hospital. Can you help me in booking a ticket from IAD to DTW?

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

USER: I have a plan to travel on 09/12 and return on 09/14.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Stephanie, no flights has been found on your preferences.

USER: Its ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.