You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Please tell me, how may I help you?

USER: I would like to attend my sister wedding, could you please help me out in booking a ticket?

ASSISTANT: Yes sure. Let me know your travelling airport codes?

USER: My airport codes are from MCO to ORD.

ASSISTANT: Can you tell me, when you want to fly?

USER: My trip dates are from 04/17 to 04/19.

ASSISTANT: May I know your name?

USER: Myself Eric Martin.

ASSISTANT: Thank you for your information. But sorry, there is no flight is available for you. Do you have any other preferable dates?

USER: No, thank you.

ASSISTANT: Welcome.