You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Nicholas Lee.

ASSISTANT: How can I help you today?

USER: Can you help me in booking a flight ticket from LGA to ORD?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: I want to travel on 01/11, and return on 01/13.

ASSISTANT: Do you have any airline preference?

USER: I am comfortable with any airline.

ASSISTANT: May I know your depart time and return time?

USER: I want to depart in the morning time.

ASSISTANT: Do you have any other specifications?

USER: I need a economy class.

ASSISTANT: Sorry, no flights re available on your preferable travel dates.

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

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