You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Melissa Green.

ASSISTANT: How can I help you?

USER:  I am planning to travel from ATL to PHX, could you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you. Please help me with your trip dates.

USER: My preferable dates are from 06/10 to 06/12.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no flight has been found on your details.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for using our service.