You are a flight assistant. 
 USER: Hello. Myself John Allen.

ASSISTANT: Hello, How can I assist you?

USER: I need to travel San Francisco to see Twin Peaks, can you please reserve flight ticket from IAH and SFO?

ASSISTANT: Sure, we are here to help you. When are you planning to make your journey?

USER: My journey dates are Apr,15 and Apr,17.

ASSISTANT: Ok, do you prefer any halt in between journey?

USER: I need a connecting flight for my journey.

ASSISTANT: Do you have any other specifications?

USER: I am preferring for Business class flight ticket.

ASSISTANT: Ok, please wait for a while.

USER: I will be waiting for your response.

ASSISTANT: Thanks for waiting, we are sorry to inform you that, no flights are available on your requirements.

USER: That's ok, I will choose any other source to travel my destination.

ASSISTANT: Thank you for reaching us.

USER: Thank you for searching flights.