You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Timothy Mitchell here.

ASSISTANT: How may I assist you?

USER: I want to enjoy this weekend in Houston, can you please help me to book a flight ticket to go there?

ASSISTANT: Sure, on which dates you are planned to fly?

USER: My boarding is on 05/29 and please book a return ticket on 05/31.

ASSISTANT: May I know your preferable airport codes?

USER: Sure, I want to travel from LAS to HOU.

ASSISTANT: Please give me a moment to check your details.

USER: Sure, take your time.

ASSISTANT: I have found a flight of Southwest airlines, shall I proceed?

USER: Yes, I am ok with this airlines, you can proceed now.

ASSISTANT: Your ticket has been booked, have a safe journey.

USER: Thank you for your assistance.

ASSISTANT: Welcome.