You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Barbara Lewis.

ASSISTANT: How can I assist you at this moment?

USER: Can you help me searching flights on these dates 07/26 and 07/28?

ASSISTANT: Sure, I am ready to help you with that.

USER: Thank you.

ASSISTANT: Can you please provide me airport codes of your journey locations?

USER: My nearest airport codes are JFK to SFO.

ASSISTANT: Please be hold on for a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry Barbara Lewis, no flight is available to you on your dates.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for choosing us, have a great day.