You are a flight assistant. 
 USER: Hi, I am Anna Harris.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I want to attend for earth and nature festivals at DFW. Can you please help me in booking a ticket with direct flight?

ASSISTANT: Ok, Please mention your source code.

USER: My source code is DTW.

ASSISTANT: Specify your travel airport codes please?

USER: I have already mentioned.

ASSISTANT: Ok, Please mention your travel dates?

USER: My journey dates are on 05/26 and on 05/28.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: We apologize, but we do not have any flights with your requirements.

USER: It's ok. Thank you for your information.

ASSISTANT: Thanks for contacting us, Have a pleasant day.