You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: I have an appointment with my family doctor in LGA. Can you please make a reservation from IAH?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, I want to travel on June 26 and need to return on June 28.

ASSISTANT:  Do you prefer any stopover in between journey?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please help me with your name for booking.

USER: Sharon Johnson here.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.