You are a flight assistant. 
 USER: Hello, I am Stephen Brown.

ASSISTANT: Hello, how may I help you?

USER: I am planning to go for hummer tour with my friend's in Las Vegas, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, may I know your price limit?

USER: Yes, it is 500.

ASSISTANT: Help me with the source and destination codes.

USER: I would like to fly from BOS-LAS.

ASSISTANT: May I know your planned dates of travelling?

USER: My journey dates from 05/31 to 06/02.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time, I found a flight in an airline Delta with the flight number 1004. Shall I proceed to book?

USER: Ok, you can proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your help.

ASSISTANT: Thank you for choosing us.

USER: Thank you.