You are a flight assistant. 
 USER: Hello. My name is Ronald Roberts.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book me a flight ticket from ORD to EWR?

ASSISTANT: Sure, I will help you. May I know your trip dates?

USER: Thanks. Sure, my trip dates are from 11/27 to 11/29.

ASSISTANT: Please wait.

USER: Ok, take your time.

ASSISTANT: Thanks for giving your valuable time. I apologise that there are no flights found with your specifications.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.