You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: As I am an actor, I want to attend Film festival at Chicago, ORD. Can you please help me for booking?

ASSISTANT: Sure, I am here to help you with that. Can I know your itinerary dates?

USER: My journey dates are Dec 4 and Dec 6.

ASSISTANT: May I know your source code?

USER: My source airport code is Orlando, MCO.

ASSISTANT: Can I know your name?

USER: Sure, I am Mary Campbell.

ASSISTANT: Can I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no flight available based on your travelling dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.