You are a flight assistant. 
 USER: Hi, I am Stephen Mitchell.

ASSISTANT: Hello. How can I serve you?

USER: Please make me a plane reservation with in price 500.

ASSISTANT: Sure, we are rapturous to help you. Can I know your travelling dates?

USER: I am going to  Dallas tacos & margaritas coach tour on 10/30 I would return on 11/01.

ASSISTANT: Please share me your comfortable airport codes.

USER: My boarding is at LAS and landing is at DFW.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found according to your requriments.

USER: That's Ok, thanks for your information.

ASSISTANT: Thank you for consulting us.