You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Jeffrey Rodriguez here. I want to travel from DCA to DEN, can you help to find a flight ticket?

ASSISTANT:   Ok  Jeffrey Rodriguez, can you please share your trip dates?

USER: My travel dates are 08/30 and 09/01.

ASSISTANT: Sorry, there is no flight found with your preferences to book a ticket for you.

USER: It's ok, thank you.

ASSISTANT: Ok, thanks for consulting us.