You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book me a flight ticket from JFK to LAX to meet my family?

ASSISTANT: Sure, May I know your travelling dates?

USER: I have planned to travel on May 18th and return on May 20th.

ASSISTANT: Do you have any connection limit? Any other preferences?

USER: I like economy class with one connecting flight.

ASSISTANT: May I know your name?

USER: Jerry Thompson.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.