You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to book a flight from LGA to ORD?

ASSISTANT: Sure, I will help you. Can I have your planned travel dates please?

USER: I want to take off on 25 Aug and return on 27 Aug.

ASSISTANT: Can I have your name please?

USER: Myself Robert Carter.

ASSISTANT: Do you need a connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Robert Carter, no flights has been found on your planned travel dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.