You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Thomas Johnson.

ASSISTANT: Ok.

USER: I need your help in booking economy class flight ticket.

ASSISTANT: Sure, May I know your travelling dates?

USER: My travel dates would be on 07/31 and 08/02.

ASSISTANT: May I know your airport codes?

USER: I would like to fly from New York, NY - LGA and fly out off Oakland, CA - OAK.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to tell that there is no flight found on your request.

USER: Ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your kind response.