You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Taylor.

ASSISTANT: How may I assist you today?

USER: I want to book a flight ticket to San Francisco SFO to attend a seminar. Can you help me with booking a connecting flight?

ASSISTANT: Sure, I am happy to help you with that. Could you provide me your planned trip dates?

USER: Thank you. My planned trip[ dates are 03/22 and 03/24.

ASSISTANT: Ok, may I know your source code?

USER: My source code is Atlanta ATL.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for approaching us.