You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I have an appointment with my family doctor in IAD. Can you please make a reservation from SEA?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I want to depart on July 22 and need to return on July 24.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Any other preferences?

USER: I prefer an economy class to travel.

ASSISTANT: May I know your name?

USER: Joseph Williams here.

ASSISTANT: Sorry, there are no flights found on your dates.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you.