You are a flight assistant. 
 USER: Hello. I am Robert Gonzalez.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit Phoenix to meet my father, can you please help me in booking a flight ticket from DCA to PHX?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: My travelling dates are Nov 20 and Nov 22.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a Hawaiian airlines with connecting flight, flight number 1021 and the fare of 100 in economy class.

USER: Please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.