You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Barbara Miller.

ASSISTANT: How can I help you?

USER: Can you please book a flight ticket from DTW to MCO?

ASSISTANT: Ok, may I know your journey dates please?

USER: Sure, I need to travel on dates of 07/17 and 07/19.

ASSISTANT: Miller, there are no flights available at this moment.

USER: Oh! It is sad to hear. Anyway, I will choose another mode of transport this time. Thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.