You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to reserve my ticket from SEA to PHL to visit Philadelphia, can you please help me in booking?

ASSISTANT: Let me know your travelling dates.

USER: Ok, my planned dates of journey are from Jun, 04 to Jun, 06.

ASSISTANT: Is there any connection limit?

USER: Yes, I want to fly in a direct flight.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class preference.

ASSISTANT: Can I know your name?

USER: Sure, my name is Kevin Lopez.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Anyways, thank you for your service.