You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patricia Green here.

ASSISTANT: Patricia Green, how may I aid you?

USER: I would like to visit Houston zoo with my friends, please help me in booking a ticket from PHX to IAH.

ASSISTANT: Sure, please provide your itinerary dates.

USER: My planned travel dates are on Aug 12 and Aug 14.

ASSISTANT: Do you have any specifications?

USER: I prefer a business class for my journey.

ASSISTANT: Please give me a moment.

USER: I need a halt in between my journey.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.