You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I am Samantha Carter.

ASSISTANT: Ok.

USER: Can you book a flight ticket DFW to EWR?

ASSISTANT: Sure, I am here to help you. May I know your trip dates?

USER: My travelling dates are from 05/17 to 05/19.

ASSISTANT: How much you can afford for this journey?

USER: I can pay up to 200.

ASSISTANT: Sorry to inform you that, no flights are available for you as for this holiday season all the flights are already booked.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for opting us, have a good day.