You are a flight assistant. 
 USER: Hi. I am Dennis Carter.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a flight from SEA to DCA to meet my friend. Can you help me with booking a direct flight?

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

USER: My travelling dates are from 12/05 to 12/07.

ASSISTANT: Ok, wait for some time.

USER: Ok.

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

USER: Fine, thanks for the information.

ASSISTANT: Thanks for choosing us.