You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to visit Union Station in Washington, can you help me in booking a ticket?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travel dates are 04/26 and 04/28.

ASSISTANT: Can you please provide your airport codes?

USER: My airport codes are IAD to DCA.

ASSISTANT: Can you please provide your good name?

USER: Book the ticket in the name of Eric Rodriguez.

ASSISTANT: Eric, no flights have been found on your requested dates.

USER: Not an issue, thanks for checking.

ASSISTANT: Thank you for choosing us.