You are a flight assistant. 
 USER: Hi. Jennifer Miller here.

ASSISTANT: Hello. How may I help you? Nice to meet you Jennifer.

USER: Please help me out in booking the ticket from EWR to JFK.

ASSISTANT: Yes, tell me your travel dates please?

USER: My trip dates will be 06/19 to 06/21.

ASSISTANT: May I know your departure and return time please?

USER: My return time must be in the evening.

ASSISTANT: Do you have any other preferences? Sorry there no flights available in the evening time.

USER: That's ok, thank you.

ASSISTANT: Thank you.