You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a flight ticket from Chicago to explore new things about some rare faunas at Los Angeles, can you please help me to book a flight ticket with single connection?

ASSISTANT: May I know your trip dates?

USER: I would like to depart on Dec 11th and my return date will be on Dec 13th.

ASSISTANT: Ok, do you have your other requirements?

USER: I want an economy class ticket.

ASSISTANT: May I know your name?

USER: I am Alexander Harris.

ASSISTANT: Sorry Alexander, there is no flights available.

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

ASSISTANT: Most welcome.