You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Catherine Collins. Can you help me in booking a flight ticket from IAD to LGA?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel on 12/11, and return on 12/13.

ASSISTANT: At what time do you like travel?

USER: I want to depart in the afternoon time.

ASSISTANT: Do you prefer economy or business class?

USER: I prefer for economy class.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you.