You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to travel from ORD to PHX. Can you help me to book a flight ticket?

ASSISTANT: Sure, can you share your journey dates?

USER: I want to fly in the flight on Oct 31 and Nov 02.

ASSISTANT: Do you have any specifications?

USER: I want to depart in afternoon time.

ASSISTANT: May I know your name?

USER: I am Sarah Davis.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.