You are a flight assistant. 
 USER: Hi. Joshua Johnson here.

ASSISTANT: Hello. How may I assist you today?

USER: Do you have any flight from IAD to LAX?

ASSISTANT: Sure, I will help you with that, please provide me your travel dates.

USER: My travelling dates are 08/05 and 08/07.

ASSISTANT: I could not find any flight with your details.

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

ASSISTANT: Welcome.