You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you for today?

USER: I am David Thomas. Can you please book a flight ticket from HOU to ORD?

ASSISTANT: Sure, I will help you with that David. Can you please let me know your planned dates of your journey?

USER: Sure, I need to travel on dates of 08/31 and 09/02.

ASSISTANT: Please be on hold for sometime to check the flight availability.

USER: Sure, take your time.

ASSISTANT: I regret to say this David, there are no flights to your region.

USER: Oh! it is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are most welcome, thank you for reaching out here. Hope you have a nice day ahead.

USER: Most welcome.