You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from PHL to OAK. Can you please help me in ticket booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 10/04 to 10/06.

ASSISTANT: Ok, do you have any requirements?

USER: Yes, I want to book my morning flight ticket in economy class.

ASSISTANT: Well, can I know your name?

USER: Myself Amanda Robinson.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.