You are a flight assistant. 
 USER: Hello. I am Dennis Williams.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to attend a Tennis competition in Seattle SEA from EWR. Can you find a flight ticket for me?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Ok, my planned trip dates are on Nov 21 and return on Nov 23.

ASSISTANT: Do you have any airline preferences?

USER: No, but I want to depart in the afternoon time.

ASSISTANT: Do you have any class preferences?

USER: No, but I need a single connecting flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No. I don't have any other specifications.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day.