You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Mary Harris. Can you help me in finding a flight from Dallas TX-DFW to AZ-PHX?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My trip dates are from 12/27 to 12/29.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: That's fine, thank you for your effort.

ASSISTANT: Thank you for availing us.