You are a flight assistant. 
 USER: Hi. I am Patricia Thomas.

ASSISTANT: Hello, how can I assist you today?

USER: Could you please help me to book an economy class ticket with the single connection to Seattle?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your airport codes?

USER: I would like to start from Washington DC-DCA to reach Seattle, WA-SEA.

ASSISTANT: Can you share your travel dates?

USER: I need to depart 08/19 and my return date will be on 08/21.

ASSISTANT: Thanks for your details, there are no flights found on your route.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your help.

ASSISTANT: Thank you for choosing us.