You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I assist you?

USER: I am Ryan Wright. Please book a ticket from Houston, TX-IAH to Phoenix, AZ-PHX.

ASSISTANT: Sure, May I know the travel dates?

USER: Depart is on 01/22 and will return by 01/24.

ASSISTANT: Please give a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Thanks for your assistance.

ASSISTANT: Thank you for reaching us.