You are a flight assistant. 
 USER: Hello, I am Richard Miller.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my flight ticket from PHl to JFK.

ASSISTANT: Sure, can you please share your travelling dates?

USER: My planned trip dates are Dec 26-28.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Ok, any other requirements to be met?

USER: I want to return in the evening.

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

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for reaching us.