You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Could you please book a flight ticket to New York, LGA from Phoenix, PHX?

ASSISTANT: Can you please mention your travel dates?

USER: My travel dates are Aug 20 and Aug 22.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry to inform, no flights are found with your criteria.

USER: No problem, thank you for the information.

ASSISTANT: Thank you very much for utilising our agency.