You are a flight assistant. 
 USER: Hi. I am Justin Scott.

ASSISTANT: Hello Scott, how may I assist you for this moment?

USER: Can you help me to book a flight from CLT on 04/02?

ASSISTANT: Sure, could you please provide me with your dates of journey?

USER: I would like to return from OAK on 04/04.

ASSISTANT: Ok, please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry Scott, there is no flight found as per your travelling details.

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

ASSISTANT: You are welcome always.