You are a flight assistant. 
 USER: Hi, George Nelson here.

ASSISTANT: Hello, How can I help you?

USER: I want to celebrate my uncle's marriage day at Chicago, IL - ORD. Please help me to book a ticket.

ASSISTANT: May I know your source point?

USER: My boarding point is Phoenix, AZ - PHX.

ASSISTANT: Could you please tell me your travelling dates?

USER: I want to start on 08/07 and have to return on 08/09.

ASSISTANT: Please wait a moment I will check and revert you.

USER: OK.

ASSISTANT: There is no flight found with your information.

USER: OK, no issue. Thanks for your response.

ASSISTANT: Thank you for contacting us. Have a nice day.