You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Will you please help me in booking a connecting flight within my route to Chicago?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I need to reach there by Nov 19 as I have a conference regarding the world health organisation and will come back after two days that is on Nov 21.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I have already mentioned that I need a connecting flight.

ASSISTANT: Can you please share your airport codes?

USER: I will be leaving from BOS as it is my nearest airport and will arrive at ORD.

ASSISTANT: Do you have any class preference?

USER: I will be okay with any class.

ASSISTANT: Do you have any airline preference?

USER: No, any airline is fine.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No, I don't have any restrictions.

ASSISTANT: May I know your good name please?

USER: I am Edward Mitchell.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.