You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you at this moment?

USER: I want to book a flight ticket under the name of Jason Wilson. Can you help me in this?

ASSISTANT: Sure, I can help you my best.

USER: Thank you.

ASSISTANT: May I know your airport abbreviates of your boarding and landing points?

USER: MY airport codes are from TX - HOU to NV - LAS.

ASSISTANT: On which dates you have planned to travel?

USER: My trip dates are 08/15 - 08/17.

ASSISTANT: Sorry, no flights are available on your specified dates.

USER: It's ok, thank you for your information.

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