You are a flight assistant. 
 USER: Hi, I am Linda Smith.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking a flight ticket from DCA to SEA?

ASSISTANT: Sure, may I know your planned dates of travel?

USER: My planned travel dates are from Aug 24th to Aug 26th.

ASSISTANT: Is there any specific class preference?

USER: No.

ASSISTANT: Do you have any requirements?

USER: Yes, I need a direct flight. I need to depart in the evening.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.