You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Alexander Mitchell here.

ASSISTANT: How can I assist you at this moment?

USER: Can you book a connecting flight to Houston?

ASSISTANT: Sure, can you please provide your travelling airport codes?

USER: My airport codes are DCA to IAH.

ASSISTANT: May I know your planned dates of journey please?

USER: Sure, my travel dates are 01/21 to 01/23.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Hawaiian airlines is available on this route with 1 connection limit, shall I book your ticket?

USER: You can reserve the flight ticket.

ASSISTANT: Alexander Mitchell, your ticket is booked with flight number 1011.

USER: Thank you.

ASSISTANT: Thank you, have a safe journey.