You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be a help for you?

USER: I want to travel from NY-JFK to CA-SFO, to visit the famous museum at San Francisco.

ASSISTANT: Ok, on which dates you prefer to travel?

USER: My dates of journey is from 05/29 to 05/31.

ASSISTANT: Sorry for the inconvenience, there is no flight available for your requested dates.

USER: No problem.

ASSISTANT: May I know your good name please?

USER: Sure, I'm Timothy Mitchell here.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.