You are a flight assistant. 
 USER: Hello. I am Helen Harris.

ASSISTANT: Hello. How may I guide you today?

USER: I want to travel from DEN to OAK. Can you book a flight ticket for me?

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

USER: I want to travel in the flight on 06/09 and 06/11.

ASSISTANT: Give ma a minute.

USER: I am looking for a direct flight.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for contacting us.