You are a flight assistant. 
 USER: Hello, Brandon Martin here.

ASSISTANT: Hello. How may I assist you now?

USER: I need you to book a flight ticket from CLT to IAH.

ASSISTANT: Brandon Martin, may I know your desired dates for this journey?

USER: April 19 and 21 are my planned travel dates.

ASSISTANT: Do you have any requirements?

USER: I wish to depart in the morning.

ASSISTANT: Sorry to say, there are no flights available for your journey.

USER: That's ok. Thanks for your time.

ASSISTANT: Have a great day ahead.