You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kimberly Davis.

ASSISTANT: How may I help you?

USER: I am looking for a flight from Oakland, can you help me out in booking flight ticket from OAK to IAD?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My trip date are from  Feb 5th till Feb 7th.

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

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thanks for choosing us, have a nice day.