You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Wright.

ASSISTANT: How can I assist you, John?

USER: I am planning to visit Washington to meet my grandparents, can you please search for flight tickets availability on 12/04 to 12/06?

ASSISTANT: Sure, may I know your respective airport codes?

USER: My nearest airport codes of journey are from DFW to DCA.

ASSISTANT: Please give me a minute.

USER: Sure, take your own time.

ASSISTANT: I found a flight in Delta airlines with price 200. Shall I book the ticket for you?

USER: Please reserve my ticket with this airlines.

ASSISTANT: Your ticket is confirmed and the flight number is 1029.

USER: Thank you for your help in booking my ticket.

ASSISTANT: Thank you for choosing us.