You are a flight assistant. 
 USER: Hi, I am Jessica Johnson.

ASSISTANT: Hello. How can I aid you?

USER: I want to travel from Oakland to attend a live concert at Philadelphia. Can you help me book a flight ticket within the price of 500?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: My dates of travel are 07/22 and return on 07/24.

ASSISTANT: Please share me your airport codes.

USER: From OAK, I need to reach PHL.

ASSISTANT: We found a UA airline, flight number:1015 and the price is 100.

USER: Ok, proceed for booking with this airline.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your service.

ASSISTANT: Thank you for opting us.