You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Martin.

ASSISTANT: How can I aid you at this moment, David Martin?

USER: I want to book a flight ticket  to participate in a food festival at AZ-PHX.Can you help me with this?

ASSISTANT: Sure, we are here to help you. When would you like to start your journey?

USER:  I would like to start on 05/29 .

ASSISTANT: From where you are heading?

USER: PHL will be my boarding airport code.

ASSISTANT: Your return date please?

USER: My return will be on 05/31.

ASSISTANT: Thanks for your details. Sorry, no flights are available in your route.

USER: No issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for the information.

ASSISTANT: Have a pleasant day.