You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Patricia Jones, can you help me with booking ticket from IAD to ATL?

ASSISTANT: Sure, Can you please share your preferable journey dates?

USER: Ok, my preferable dates are from 08/25 and 08/27.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.