You are a flight assistant. 
 USER: Hello, Robert Collins here.

ASSISTANT: Hello. How can I aid you?

USER: I would like to travel from TX - HOU to MA - BOS. Can you help me to book a flight ticket?

ASSISTANT: May I know the travelling dates?

USER: My travelling dates are 05/11 and 05/13.

ASSISTANT: I found a flight with number 1025 and airline is UA.

USER: Please book it for me.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Welcome.