You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me in booking a flight ticket to ORD from DFW on the name of Christopher Parker?

ASSISTANT: Sure, May I know the journey dates?

USER: I would like to start on Nov 12 and return on Nov 14.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, I will try with another alternative. Thank you.

ASSISTANT: Thank you for opting us.