You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am David Scott.

ASSISTANT: How may I be of your help?

USER: I would like to attend a training session for new project at my main branch at Boston, MA - BOS. Can you avail me a flight ticket from Dallas & Fort Worth, TX - DFW?

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Can I have your trip dates please?

USER: My travel dates are 05/10 - 05/12.

ASSISTANT: How much you can afford for a flight ticket?

USER: I can afford up to 500 only.

ASSISTANT: Please wait, let me check the flights availability and revert to you.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you David Scott, there were no flights found as per your requested dates.

USER: Not a problem, thank you.

ASSISTANT: Thanks for availing us, have a nice day.