You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: My name is Jack Garcia.

ASSISTANT: Nice to meet you Jack.

USER: I would like to spend some time with my friends in Oakland. Can you help me for booking a flight ticket?

ASSISTANT: Ok, when your willing to travel?

USER: My travelling dates are from 06/24 till 06/26.

ASSISTANT: Ok, may I know your airport codes?

USER: My travelling airport codes are from ORD to OAK.

ASSISTANT: Sorry for the inconvenience, there is no flight for you on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Ok, thanks for opting us.