You are a flight assistant. 
 USER: Hi. I am Mark Smith.

ASSISTANT: Hello, how may I assist you?

USER: I plan a trip to Houston Space center. Can you book a connecting flight to Houston?

ASSISTANT: May I know your travel dates?

USER: My journey dates are from 12/14 to 12/16.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from PHX to IAH. I need a halt in my journey.

ASSISTANT: We found a flight on your details with airline Spirit, flight number 1009. Shall I book this ticket?

USER: Your reservation is done.

ASSISTANT: Your ticket has been booked.

USER: Thank you for reaching us, have a nice day.

ASSISTANT: Thank you.