You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Lopez.

ASSISTANT: How can I assist you today?

USER: I would like to book a ticket to Washington DC, can you please help me out?

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

USER: I am travelling on these dates 02/15 and 02/17.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: I am flying from DTW to DCA.

ASSISTANT: Please give me a moment.

USER: Sure, take your time. Make sure my price limit is 200.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: Ok no problem, thank you for your services.

ASSISTANT: Welcome, have a great day.