You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Thomas.

ASSISTANT: What service do you need from us?

USER: I planned to travel from HOU to ORD, can you please help me to book a flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please tell me your trip dates?

USER: I planned to travel on 12/08 and 12/10.

ASSISTANT: Sorry to tell you, there are no flights available with your dates in this route.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.