You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to attend a live concert in PA, could you please help me to book a direct flight?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I would like to depart on Dec 6th and my return date will be on Dec 8th.

ASSISTANT: Do you have any preferences about flight connections?

USER: No more particular specifications.

ASSISTANT: Please provide your airport codes.

USER: LGA and PHL are my exact airport attributes.

ASSISTANT: Please mention your name.

USER: I am Nichole Mitchell.

ASSISTANT: There are no flights found under your preferable details. Thanks for reaching us, have a great day.

USER: That's ok, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Welcome.