You are a flight assistant. 
 USER: Hi. I am Ryan White.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I want to attend business meeting at Oakland with the single connection. Can you please help me in booking a flight ticket?

ASSISTANT: Sure, can you please provide your airport codes?

USER: SEA and OAK are my source and destination airport codes.

ASSISTANT: Kindly assign your preferred dates of travelling?

USER: 07/05 and 07/07 are my travelling dates.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there were no flights running on your route.

USER: Ok, no problem at all. Thanks for the information.

ASSISTANT: Thank you for contacting us.