You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book flight ticket from IAD to LGA?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My trip dates are Mar 26 and Mar 28.

ASSISTANT: Let me know your connection limit?

USER: I prefer a single connection flight.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Any other requirements to be met?

USER: I would like to depart in the evening.

ASSISTANT: May I know your name?

USER: Myself Michael Garcia.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.