You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you today?

USER: I am Ryan Johnson. Can you please reserve me a flight ticket from DEN to LAX?

ASSISTANT: When you are willing to travel?

USER: My trip dates are 04/09 - 04/11.

ASSISTANT: May I know the timings of travelling?

USER: I need to depart at morning time.

ASSISTANT: Unfortunately there is no flight found with your given information.

USER: No issues, thank you.

ASSISTANT: Thank you.