You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to meet my family after a long gap, please help me in booking a ticket.

ASSISTANT: Sure, please tell me your planned travelling dates.

USER: My planned travelling dates are 01/13 and 01/15.

ASSISTANT: Ok, please tell me your airport codes.

USER: My airport codes are PHX and LAS.

ASSISTANT: Ok, could I know your name please?

USER: My name is Helen Jones.

ASSISTANT: Sorry, there is no plane on your requested travel dates.

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

ASSISTANT: Thank you.