You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca King.

ASSISTANT: How may I help you?

USER: I need a flight ticket on 03/14 to go Washington for my business meeting, can you help me with that?

ASSISTANT: Please provide your travelling codes.

USER: I want to fly from OAK to IAD.

ASSISTANT: Can I know your return date?

USER: Yes, I want to back on 03/16.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: No issues, thank you.

ASSISTANT: Thanks.