You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Donald Miller.

ASSISTANT: How can I aid you today?

USER: I want to book a ticket from OAK to PHX. Could you help me?

ASSISTANT: Sure, we are mirthful to aid you.

USER: Thank you.

ASSISTANT: Let me know your depart date and arrival date.

USER: My preferable dates are from 04/06 to 04/08.

ASSISTANT: Thanks for sharing your details. Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for your precious time. There are no flights found on your route.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.