You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

USER: I am Amy Brown and I want to travel from Oakland OAK to Chicago ORD. Could you please book a flight ticket ?

ASSISTANT: Sure, could you please provide me your travelling dates?

USER: Yes, my date of travelling is on 02/08 and returning on 02/10.

ASSISTANT: Please wait a moment, I will get back to you with the flight details.

USER: Sure.

ASSISTANT: Sorry Amy, I couldn't find any flight on the dates you requested for.

USER: OK, thank your providing me the information.

ASSISTANT: You are welcome. Thank you for approaching us.