You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Larry Parker here. Please help me out in booking the ticket from DEN to LAX.

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

USER: Sure my trip dates are 07/31 and 08/01.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: Its ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.