You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking a flight ticket from JFK to SFO?

ASSISTANT: Sure, please provide your itinerary dates.

USER: I want to fly on Oct 27 and return on Oct 29.

ASSISTANT: Do you have any specifications?

USER: I would like to return in the evening time.

ASSISTANT: Which airlines do you prefer?

USER: I am comfortable with airline.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: May I know your name?

USER: Myself Kenneth Campbell.

ASSISTANT: Sorry Kenneth Campbell, no flights are available in the evening.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.