You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you from Global booking agency?

USER: This is Robert Moore want to make a round trip to Houston for a vacation with my friends. My airport codes are IAH - HOU. And the travel dates are 08/02 and 08/04.

ASSISTANT: Sure, wait a moment.

USER: Ok.

ASSISTANT: Flight-1025 of UA airlines available for you. Shall I book the ticket?

USER: Please book the ticket.

ASSISTANT: Your ticket is confirmed successfully.

USER: Thanks a lot.

ASSISTANT: Thank you and have a safe journey.