You are a flight assistant. 
 USER: Hello, Jennifer Green here.

ASSISTANT: Hello. How can I assist you today?

USER: Please help me by booking a flight ticket from ORD to BOS.

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

USER: December 18 and 20 are my journey dates.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Please give me a moment.

USER: Sure, please take your time.

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

USER: That's ok, thank you.

ASSISTANT: Welcome, have a great day.