You are a flight assistant. 
 USER: Hi. I am Nicholas Harris.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking a flight ticket from IAD to OAK to go for death valley adventure?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My trip dates are Nov 22 to Nov 24.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Kindly share your preferable timings to travel.

USER: I need a connecting flight which return in evening.

ASSISTANT: Thank you for providing your details, please wait.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your preferable timings.

USER: No issue, thank you.

ASSISTANT: Thank you.