You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Pamela Mitchell. I would like to enjoy my weekend trip with my friends. Can you please book a ticket within the price of 200?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are 03/11 and 03/13.

ASSISTANT: Can you please mention your source and destination airport codes?

USER: Sure, my source and destination airport codes are PHX and DFW.

ASSISTANT: Ok, please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: I apologise for this situation. I did not find any flight ticket on your preferable route.

USER: That's ok, thank you for checking.

ASSISTANT: Most welcome.