You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you reserve a seat with a price of 200? I need a connecting flight also.

ASSISTANT: Ok, may I know your planned journey dates?

USER: Yes. My scheduled dates to travel are 07/21 and 07/23, because I have to attend to science seminar on 07/22.

ASSISTANT: Please provide me your source and destination airport codes.

USER: Atlanta, ATL is my source and Los Angeles, LAS is my destination.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given dates. May I know your good name please?

USER: Ok, I will check with other alternative, I am Rachel Lopez. Thanks for your response.

ASSISTANT: Thank you for choosing us.