You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to attend my office meeting at Washington, can you please book me a ticket from Detroit?

ASSISTANT: Sure, when would you like to travel?

USER: I would like to leave on June 12th and return on June 14th.

ASSISTANT: Help me with the airport codes?

USER: Airport codes are from DTW to IAD.

ASSISTANT: Do you have any preferences in airlines?

USER: Yes, normal cost airline.

ASSISTANT: May I know your name please?

USER: Myself Cynthia Hernandez.

ASSISTANT: We found a Delta airlines with single connection fare of 100 with 1000 number. Shall I reserve it?

USER: It's good. Please book this flight ticket for me.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your kind help.

ASSISTANT: Thank you for your approach.