You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me in booking of the ticket.

ASSISTANT: May I know your name please?

USER: Myself Kathleen Martinez. I want to travel from OAK to CLT.

ASSISTANT: Will you provide your travelling dates?

USER: Yes, I prefer to travel from 06/21 to 06/23 dates.

ASSISTANT: OK, please give me a moment.

USER: Sure.

ASSISTANT: Sorry to say that Kathleen there is no flights found as per your requirements.

USER: OK, no issues. Thank you for the information.

ASSISTANT: Thanks for reaching us.Have a nice day.