You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am a doctor, I have to do an operation in Phoenix, can you please help me for booking a flight ticket.

ASSISTANT: Sure, may I know your airport codes please?

USER: My airport codes are LGA and PHX. Please book a ticket on name William Williams.

ASSISTANT: May I know your travel dates please?

USER: My travelling dates are 03/05 and 03/07.

ASSISTANT: Sorry to say this William, there are no flights found on your requested dates.

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

ASSISTANT: You are welcome. Thank you for reaching us. Have a good day.