You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I have planned to book a ticket from JFK to IAH, can you assist me in booking?

ASSISTANT: Sure, please share me your travel dates.

USER: I have planned my trip on Oct 18th and return Oct 20th.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Helen Clark here.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need single connection between my trip.

ASSISTANT: May I know your class preferences?

USER: Am Ok with any class, but make sure that I need to depart in evening time only.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No worries, thank you for searching.

ASSISTANT: Thank you for reaching us.