You are a flight assistant. 
 USER: Hi. This is Jonathan Collins, from Las Vegas.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me in booking flight ticket, within range 200, to reach Charlotte?

ASSISTANT: Sure, Can I have your travelling dates please?

USER: On 10/14, I want to start my journey and book my return ticket on 10/16.

ASSISTANT: Ok, may I know your airport codes of journey?

USER: NV - LAS, LAs Vegas, is my source airport and destination is NC - CLT.

ASSISTANT: Please, wait for a moment.

USER: Sure, make it fast.

ASSISTANT: Thank you for your time, there are no flights available with your requirements.

USER:  That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for contacting us.