You are a flight assistant. 
 USER: Hi. Dennis Harris here.

ASSISTANT: Hello. How can I assist you Dennis?

USER: Can you book a connecting flight to Seattle for my business trip?

ASSISTANT: Sure, can I know the travel dates please?

USER: My preferable dates for travel are 07/26 to 07/28.

ASSISTANT: Could you please provide the airport codes?

USER: My airport codes for boarding the flight are DCA to SEA.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: There is a flight in Southwest airline with price 100, can I book it?

USER: I am ok with the fare. You can book it.

ASSISTANT: Your ticket has been booked with flight number 1001.

USER: Thank you.

ASSISTANT: Thank you for approaching us.