You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: Can you help me to book a ticket from DTW to IAH?

ASSISTANT: Sure, when are you planning to make your trip?

USER: Ok, please can I know if there is a flight ticket available for the dates May 1st and May 3 respectively?

ASSISTANT: How many connections do you need?

USER: Can you check for a connecting flight?

ASSISTANT: Any other requirements to be met?

USER: Ok, please check for a business class flight.

ASSISTANT: Please forward your name.

USER: My name is Linda Nelson.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us.