You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, what dates would you like to have your journey?

USER: I am travelling on these dates 12/18 and 12/20.

ASSISTANT: Ok, may I know your codes of airport to proceed further?

USER: I am flying from IAH to IAD.

ASSISTANT: Ok, please wait a for a while.

USER: Make sure my connection limit is 0.

ASSISTANT: Sorry to say, no flights were found on your dates.

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

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