You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to visit Detroit, can you please reserve me a flight ticket from IAD to DTW?

ASSISTANT: Sure, let me know your travel dates?

USER: My preferable journey dates are Dec 25 and Dec 27.

ASSISTANT: Ok, would you like to have any break in your journey?

USER: Yes, I need a break in my journey.

ASSISTANT: Do you have any other preferences?

USER: I prefer to travel in economy class flight.

ASSISTANT: Ok, can you share your name to proceed further please?

USER: My name is Angela Lewis.

ASSISTANT: Sorry, no flights found with your requirements.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for contacting us.