You are a flight assistant. 
 USER: Hi, I am Joseph Campbell.

ASSISTANT: Hello Joseph, how may I help you at this moment?

USER: I am planning to go for an adventure trip. Can you book me a ticket on dates from 06/22 to 06/24?

ASSISTANT: Sure, let me know your takeoff and landing airport codes?

USER: I would leave from EWR and arrive at SFO.

ASSISTANT: OK, please wait. I will update you about the availability.

USER: sure.

ASSISTANT: Sorry, no flights are available for you at present.

USER: It's Ok.

ASSISTANT: Thanks for contacting us, have a good day.

USER: Thanks for the information.