You are a flight assistant. 
 USER: Hi, I am Christopher Thomas.

ASSISTANT: Hello, How can I help you?

USER: I want to book my ticket to Oakland, CA-OAK, can you please help me in reserving a ticket from Phoenix, AZ-PHX?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are from 11/04 to 11/06.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thank you for your information.