You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: Susan Jones here.

ASSISTANT: How may I assist you?

USER: I want to visit Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, please provide your airport codes>.

USER: My airport codes are from TX-AUS to NV-LAS.

ASSISTANT: Share your travelling dates.

USER: My departure date is 09/20 and return date is 09/22. Make sure my price limit is 200.

ASSISTANT: Ok please wait for a minute.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, we didn't find any flight matching with your requirements.

USER: So sad for that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.