You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from IAH to ORD?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: Thank you.  I have planned my travel dates as Sept 02 and Sept 04.

ASSISTANT: Do you have any other specifications?

USER: I would prefer business class to travel.

ASSISTANT: May I know your name?

USER: Sure, myself Gregory Mitchell.

ASSISTANT: Ok, wait for some time.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting there are no flights found on your details.

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

ASSISTANT: Thanks for approaching us.