You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Cynthia Clark here. Will you find a flight from IAD to DFW?

ASSISTANT: Sure, I will help you. May I know travelling dates please?

USER: My departure date is 08/18 and return date is 08/20. Make sure my connections limit is 0.

ASSISTANT: Ok, please wait a moment. Sorry, there are no flights with connection 0.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for choosing our services.