You are a flight assistant. 
 USER: Hi.

ASSISTANT: ￼Hello. How can I aid you?

USER: I am Christine Evans. I want to book a flight ticket to Washington to visit national mall. Please help me with a connecting flight.

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 07/01 to 07/03.

ASSISTANT: Provide me your source and destination points?

USER: I want to fly from DFW to DCA.

ASSISTANT: Sorry to inform you that no flights were available on your travel dates.

USER: No issues, thank you.

ASSISTANT:  Thank you for availing us.