You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Stephanie Johnson. I want to book a flight ticket within my price limit 500. Will you help me in flight booking?

ASSISTANT: Sure, can you provide me your travelling dates?

USER: My travelling dates on 05/26 to 05/28.

ASSISTANT: OK, do you need any connection limit?

USER: I am planning to travel in Big Bus to visit Union Station in DC - IAD and my origin from NC - CLT. I need a connecting flight.

ASSISTANT: OK, please wait for few minutes.

USER: Sure.

ASSISTANT: Sorry to say that there are no flights found with your requirements.

USER: Ok, not an issue. Thank you, for your fast response.

ASSISTANT: Thank you, for reaching us.