You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Clark.

ASSISTANT: Clark, how can I aid you today?

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

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Sure, I need to travel on dates of Aug 05 and Aug 07.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure, take your time.

ASSISTANT: Sorry Sarah, there are no flights available on your requested dates.

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

ASSISTANT: Welcome, thank you for choosing us. Have a great day.