You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Steven White.

ASSISTANT: How may I help you?

USER: I am looking for a flight from ORD to SFO, can you help me out in booking the flight ticket if you find a best flight in my route please?

ASSISTANT: Sure, I am here to help you with the ticket booking. Can you please help me with travelling dates?

USER: My trip dates are from 10/06 till 10/08.

ASSISTANT: Ok, please hold on for a minute.

USER: Ok.

ASSISTANT: Sorry for the trouble, there are no flights available in this route with the details you have given.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us. Have a nice day.