You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Frank Hernandez. I planned to travel from HOU to CLT, can you please help me in booking a flight ticket?

ASSISTANT: Can you please tell your travelling dates?

USER: I prefer to travel on 03/28 and 03/30.

ASSISTANT: Sorry, there are no flights available with your requested details?

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you and have a nice day.