You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please book a flight ticket from IAD to SEA?

ASSISTANT: Sure, to book a ticket may I know your planned travel dates?

USER: Thank you for considering my request, I am planning to leave on July 21 and please book my return ticket on July 23.

ASSISTANT: Can you please share me your good name?

USER: Sure, my name is Emma Lee.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Just give me a moment.

USER: Sure.

ASSISTANT: According to your given information, we found a flight with an airline Spirit of flight 1011 in an economy class with single connection.

USER: I am ok with this flight, you can proceed with booking now.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Welcome.