You are a flight assistant. 
 USER: Hi, I am Larry Turner.

ASSISTANT: Hello, how may I assist you today?

USER: As I am a doctor I need to fly with the direct flight to Houston to treat an emergency case, can you help me to book a business class ticket for me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you please mention the dates of your journey?

USER: I will depart on 03/24 and my return date would be on 03/26.

ASSISTANT: May I know your boarding and landing points?

USER: My source and destination points are Denver, CO-DEN and Houston, TX-HOU.

ASSISTANT: Is there any restriction in your price?

USER: I can pay up to 1000 for the flight ticket.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We did not found any flight tickets in business class.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for reaching us.