You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Debra Clark here, I have some work in ATL, so can you help me booking flight on 07/16?

ASSISTANT: Sure, I will help you in booking. Can you please provide me your source airport code?

USER: I am going to return my source airport code OAK on 07/18.

ASSISTANT: Ok, give me a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: Yes, I found a direct flight for you. Shall I proceed for booking?

USER: Provide flight with connection 1.

ASSISTANT: Sorry, there is no flight is available for you with single connection.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Welcome. Thank you for choosing us.