You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Angela Clark. I want to book a flight ticket in the morning on 09/02, can you help me with booking please?

ASSISTANT: Sure, may I know your arrival date?

USER: I want to return on 09/04.

ASSISTANT: Can you please share your source and destination points?

USER:   My airport codes are DFW and IAD.

ASSISTANT: Is there any class preference?

USER: No, I am ok with any class.

ASSISTANT: Ok, please wait a minute.

USER: Ok, make sure I need a return ticket in the morning.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you.