You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I am Melissa Green. I am planning to meet my college friend's in IAH, would you please aid me in making an airline reservation from DFW?

ASSISTANT: Sure, I am here to help. Please share your planned travel dates.

USER: My planned travel dates are Mar 31st and Apr 2nd.

ASSISTANT: Please let me know if you have any other preferences.

USER: I will prefer to travel in business class.

ASSISTANT: Thanks for your details, we have don't have any flight ticket available in business class.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for checking it with us.