You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Baker.

ASSISTANT: How may I assist you?

USER: I am planning to visit my nephew's house in Washington, can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I want to depart on 09/26 and return on 09/26.

ASSISTANT: Can you please share me your airport codes?

USER: I will board at PHL and land at DCA.

ASSISTANT: We found a flight on your details with airline Frontier, flight number: 1019. Shall I book this ticket?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for reserving my ticket.

ASSISTANT: Thank you.