You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth Lopez here.

ASSISTANT: How may I help you today?

USER: I want to attend a Marriage in Seattle. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your travelling airport codes?

USER: My airport codes are LAS and SEA.

ASSISTANT: Please mention your travelling dates?

USER: My travelling dates are 11/03 and 11/05.

ASSISTANT: Do you need any specifications?

USER: I want to departure on evening.

ASSISTANT: May I know your connection limit?

USER: I want direct flight.

ASSISTANT: Please wait a moment.

USER: Ok, I would prefer economy class.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching our service.