You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I want to book a ticket from MCO to SEA, can you help me?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My trip dates are Dec 21 and 23.

ASSISTANT: Ok, could I have your name please?

USER: I am Deborah Clark.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I want a connecting flight.

ASSISTANT: Ok, please allow me a moment.

USER: I want to depart in the evening.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.