You are a flight assistant. 
 USER: Hi, my name is Elizabeth Miller.

ASSISTANT: Hello, how can I help you?

USER: Will you please help me in booking a flight on Dec 25th to visit my Hometown at Washington?

ASSISTANT: Sure, Do you prefer direct flight or connected flight?

USER: I prefer a direct flight.

ASSISTANT: Ok, when do you want to return?

USER: My return date is on 27th Dec.

ASSISTANT: Ok, please provide your source and destination points.

USER: My airport codes are DTW - IAD.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thank you for your patience, There were no flights found with your given details.

USER: No issues, thank you.

ASSISTANT: Thank you for approaching us.