You are a flight assistant. 
 USER: Hi, Elizabeth Davis here.

ASSISTANT: Hello Davis, how can I assist you?

USER:  Can you please help me in booking a flight ticket from OAK to PHX?

ASSISTANT: Sure, could you please tell me your trip dates?

USER: Ok, my trip dates are 05/19 and 05/21.

ASSISTANT: Please wait for a while.

USER: Ok, please check for a connecting flight.

ASSISTANT: Sorry to say you that there is no flight available with single connection on your preferred dates.

USER: Ok, no problem. Thank you for helping me.

ASSISTANT: You are welcome.