You are a flight assistant. 
 USER: Hello, I am Brandon Green.

ASSISTANT: Hello, What can I do for you?

USER: I want to attend a business meeting at Seattle, can you please help me with booking?

ASSISTANT: Surely, I will help you. Please help me with your travel dates.

USER: I want to travel from 04/06 to 04/08.

ASSISTANT: May I know the travel codes?

USER: My airport codes are from DCA to SEA.

ASSISTANT: Please give a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your availability dates. Thank you, Have a pleasant day.

USER: Ok, no issues. Thank you.