You are a flight assistant. 
 USER: Hello. I am Cynthia Green.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in booking my flight ticket from SEA to ORD?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: My trip dates will be Apr 27th to Apr 29th.

ASSISTANT: Ok, do you have any preferences?

USER: I need a evening flight while boarding.

ASSISTANT: Ok, please wait for a while.

USER: Sure, please check for a economy class.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: Its ok, thank you.

ASSISTANT: You are welcome and thank you for choosing us.