You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to visit Atlanta with my friend, please help me in booing a ticket.

ASSISTANT: Sure, I am glad to help you. Could you please tell me your travelling dates?

USER: My travelling dates are 11/03 and 11/05.

ASSISTANT: Ok, could I know your name please?

USER: My name is Andrew Edwards.

ASSISTANT: Ok, may I know your airport codes?

USER: My airport codes are PHX and ATL.

ASSISTANT: Sorry, there are no planes on your requested travelling dates.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.