You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me with flight ticket booking which will depart in the afternoon time?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Thank you and I would like to take off on July 28 and I will be back on July 30.

ASSISTANT: Please provide your airport codes.

USER: Sure, my preferable airport codes are from DTW to SEA locations.

ASSISTANT: Do you have any specifications about flight connections?

USER: I need a single drop off in my trip.

ASSISTANT: Please mention your name.

USER: My name is Brian Baker.

ASSISTANT: There is no flights found under your preferable details.

USER: Sad to hear that one, I can prefer any other source. Thank you for your help.

ASSISTANT: Welcome, have a great day.