You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Anderson.

ASSISTANT: How could I support you today?

USER: I would like to travel from DCA to meet my friend. Could you please help me to book a ticket to PHX?

ASSISTANT: Sure, to reserve a ticket may I know when you are willing to travel?

USER: My travelling dates will be on 04/21 to 04/23.

ASSISTANT: Can you please share me your budget for flight ticket?

USER: I can afford up to 5000.

ASSISTANT: We found a flight with an airline Southwest of flight 1027 and cost is 200 in economy class. Would you like me to proceed?

USER: You can proceed to booking.

ASSISTANT: Your seat has been reserved.

USER: Thank you.

ASSISTANT: Than you for opting us.