You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need your help in booking flight ticket because I am not aware of booking a flight ticket.

ASSISTANT: Sure, can you please help me with your journey dates?

USER: Sure, 09/04 and 09/06 are my journey dates.

ASSISTANT: May I know your airport codes?

USER: DFW and LAS are my airport codes.

ASSISTANT: Can you help me with your name?

USER: David Clark is my name.

ASSISTANT: Do you have any price limit?

USER: 200 is my price limit.

ASSISTANT: Thank you for your details. Sorry, we did not found any flight based on your fare limit.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.