You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I am Robert Thomas want to visit Phoenix on 04/23 and intend to return on 04/25. Can you help me to book a flight ticket?

ASSISTANT: Can you please mention the source and destination details of your journey?

USER: Sure, I want to fly from HOU to PHX.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, there is a flight 1009 in Delta airline has the price 100.

USER: Yes, proceed with my booking.

ASSISTANT: Your booking is done, have a safe journey.

USER: Thank you.

ASSISTANT: You are welcome.