You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Alexander Jackson.

ASSISTANT: Jackson, how may I assist you today?

USER: My friend is leaving to Phoenix on an occasion . Can you please book a ticket for him i will provide his details.

ASSISTANT: Sure, I am here to help you let me know your airport codes?

USER: Ok, I am providing the airport codes. My departure airport code is HOU and arrival PHX.

ASSISTANT: Ok, please can you share your friend travelling dates?

USER: My travelling dates are 02/14 and 02/16.

ASSISTANT: Ok, wait for a moment, please to check availability of flights.

USER: Sure, take your time.

ASSISTANT: Sorry to say this, no flights as per your requirements.

USER: It's ok, thank you for your services.

ASSISTANT: My pleasure, have a great day.