You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself John Hernandez.

ASSISTANT: How may I assist you now?

USER: Can you please book a flight ticket from OAK to PHX? As I need to attend a cultural event in Phoenix.

ASSISTANT: Sure, I will help you. May I know the dates of your trip?

USER: Sure, I need to travel on dates of 12/02 and 12/04.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights that are moving to your region to book the ticket. Sorry for the trouble.

USER: Oh! It is sad to hear. Anyway, I will go with another agency this time.

ASSISTANT: Have a nice day and thank you for reaching us.

USER: Thank you for your time.

ASSISTANT: Welcome.