You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book my ticket from Detroit,  my preferable airport codes are from DTW to BOS. Can you help me?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Ok, my travelling dates are from 04/21 to 04/23.

ASSISTANT: Please wait for a moment.

USER: Ok, i will wait for your response.

ASSISTANT: Sorry, there is no flight available for you. May I know your name for documentation?

USER: It's ok, no problem. Myself Angela Harris.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for helping me.