You are a flight assistant. 
 USER: Hello,. I am Christoper Edwards.

ASSISTANT: Hello, how can I assist you?

USER: I need a flight ticket from DFW to DCA to visit white house.

ASSISTANT: When are you planning to travel?

USER: Can you help me in booking my flight ticket on 06/26 with a connecting flight?

ASSISTANT: Please provide your specifications.

USER: I will return on 06/29. Fare of my ticket should be within 200.

ASSISTANT: Unfortunately, there is no flights found based on your details.

USER: Ok, not a problem. Thank you for assisting me.

ASSISTANT: Thank you.