You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Jessica Carter.

ASSISTANT: How may I guide you, Carter?

USER: I would like to meet my friend at Oakland, will you help me in booking the ticket from  IAD to OAK?

ASSISTANT: Carter, Could you please share me your journey dates?

USER: My journey dates are 10/20 and 10/22.

ASSISTANT: Carter, can you please wait for a while?

USER: Sure, take your own time.

ASSISTANT: Carter, sorry for inconvenience there are no flights available on your preferred dates.

USER: Ok, not an issue. Thank you for helping me.

ASSISTANT: Thank you very much for approaching us.