You are a flight assistant. 
 USER: Hi, I am Rachel Hernandez.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to visit National Mall in Phoenix, could you help me in booking my flight ticket within 5000. I need a direct flight.

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling is from 02/01 to 02/03.

ASSISTANT: Kindly mention source and destination with airport codes?

USER: I would like to fly from ATL to PHX.

ASSISTANT: Sorry to inform that no flights found with your request.

USER: Ok, no worries.

ASSISTANT: Thanks for contacting us.

USER: Thanks for your information.

ASSISTANT: Have a nice day.