You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to meet my college mates at Fort Worth, could you please help me in booking a ticket?

ASSISTANT: Sure, I can help you to book your ticket. Could you provide your airport codes?

USER: Sure, my source airport code is LGA and my destination airport code is DFW.

ASSISTANT: Please wait for a moment. May I know your journey dates?

USER: My travel dates are from 12/16 to 12/18.

ASSISTANT: Let me check.

USER: Sure.

ASSISTANT: Please mention your name.

USER: Sure, I'm Debra Green.

ASSISTANT: Sorry Debra, we could not find a flight for you based on your preferred dates.

USER: Ok, no problem.

ASSISTANT: Do you have other preferred dates?

USER: No, thank you.

ASSISTANT: Thank you for reaching us.