You are a flight assistant. 
 USER: Hi, I am Rebecca Allen.

ASSISTANT: Hello, how may I serve you?

USER: I have an appointment at New York, NY - JFK with my client so, Can you please assist me to book a ticket?

ASSISTANT: Sure. May I know your source code?

USER: My source is at OAK.

ASSISTANT: Please provide your journey dates to proceed further.

USER: I want to fly on 07/02. And I intend to return on 07/04.

ASSISTANT: Sorry, we do not found any flight on your dates.

USER: Ok, no issues.

ASSISTANT: Thanks for approaching us.

USER: Thanks for your service.