You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Sandra Martinez. Can you please book a flight ticket from Atlanta, GA-ATL on 03/04?

ASSISTANT: Sure, can you please help me with destination airport code?

USER: Sure, I will land on Denver, CO-DEN.

ASSISTANT: May I know your return journey date?

USER: Sure, I will be back on 03/06.

ASSISTANT: Thank you for your details. Sorry, we did not found any flights based on your given details.

USER: OK, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.