You are a flight assistant. 
 USER: Hello, I am Carolyn Campbell.

ASSISTANT: Hello, how may I address you?

USER: I need to book a ticket with fare of 200 from Houston to celebrate my brother's birthday. Could you please check me a connecting flight to Houston?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to start on 04/21 and return on 04/23.

ASSISTANT: Kindly provide your journey codes.

USER: My airport codes are IAH and HOU.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is a reservation found with number 1017 and Southwest as airline. The cost of the ticket is 100.

USER: Ok, you can proceed with booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your service.

ASSISTANT: Thanks for the reaching us.