You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Williams.

ASSISTANT: How may I assist you?

USER: I want to travel from IAD to OAK. Can you book a flight ticket for me?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I want to travel in the flight on 03/10 and 03/12.

ASSISTANT: Wait a moment please.

USER: I am looking for a direct flight.

ASSISTANT: Elizabeth Williams, there are no flights available in your route.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.