You are a flight assistant. 
 USER: Hi. I am Patrick Thompson.

ASSISTANT: Hello, how can I help you?

USER: I intend to visit US Marine Corps Reserve Center in Charlotte on 08/20, can you please book a flight ticket for me?

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: Can you share me your source point and destination point?

USER: Sure, my source point is Washington DC - IAD and my destination code is NC - CLT.

ASSISTANT: May I know your return date?

USER: I want to catch return flight on 08/22.

ASSISTANT: Ok, wait for some time.

USER: OK.

ASSISTANT: Thanks for waiting there is no flights found on your details.

USER: Ok, no issues. Thanks for the response.

ASSISTANT: Thanks for approaching us.