You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Patricia Thompson. Can you help me with booking ticket from DEN to ATL?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable travelling dates?

USER: Sure, my trip dates are 05/24 and 05/26.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for contacting us.