You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel to PHX, can you please reserve flight ticket from OAK?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, my planned travelling dates are Jan, 18 and 20 respectively.

ASSISTANT: May I know your name please?

USER: Frank Davis here.

ASSISTANT: Do you have any preferences?

USER: Yes, I used to travel in normal cost airline and I need to return at evening.

ASSISTANT: Sorry, no flights were running in your desired routes.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.