You are a flight assistant. 
 USER: Hello, I am Barbara Carter.

ASSISTANT: Hello, how shall I address you?

USER: I am planning for a Grand Canyon Adventure at Phoenix, can you help me with booking a flight ticket?

ASSISTANT: Sure, for that I need to know your source and destination. Can you help me by providing those details?

USER: Sure, my source is IAD and destination airport code is PHX.

ASSISTANT: Ok, may I know your journey dates?

USER: My travel dates are 04/21 to 04/23.

ASSISTANT: Do you have any connection preference?

USER: I need a direct flight to Phoenix.

ASSISTANT: Please give me some time I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for being patient, unfortunately due to busy schedule there are no flights found.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us, have a nice day.

USER: Thanks for the help.