You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I will travel from IAD to ORD, can you please book my flight ticket?

ASSISTANT: Ok, please can I know your dates of journey?

USER: I have to depart on May 30th and return back on June 1st.

ASSISTANT: Ok, please can I know your preferred connection limits?

USER: I prefer for a single connection flight.

ASSISTANT: Sorry, there is no flight available to book a flight ticket at your location.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Ok, please may I know your name?

USER: My name is Donald Green.

ASSISTANT: Ok, thank you for choosing our agency.

USER: You are welcome.