You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to surprise my brother on his birthday. So, I want you to book a flight ticket to Las Vegas, NV-LAS on 05/07. Can you help me with this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your price limit please?

USER: Sure, I can spend up to 1000.

ASSISTANT: Ok, please share your source code.

USER: Sure, I will board from TX-DFW.

ASSISTANT: Could you please share your return date?

USER: I will return on 05/09.

ASSISTANT: Ok, may I know your name please?

USER: Please book the ticket on the name John Clark.

ASSISTANT: Thank you, sorry no flights found with your details.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for reaching us, have a nice day.