You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight from LGA to attend at meeting with client. Can you help me to book a flight to DEN?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will fly on Sept 02 and return on Sept 04.

ASSISTANT: On which name shall I reserve flight ticket?

USER: My name is Nancy Brown.

ASSISTANT:  Do you need any specifications?

USER: I prefer a connecting flight.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.