You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Myself Nancy Taylor, can you help me to book a flight ticket from New York, EWR to Phoenix, PHX?

ASSISTANT: Ok, now please share your travel dates?

USER: Ok, please book for the dates 09/13 and 09/15 respectively.

ASSISTANT: Thanks for waiting Nancy. But I am sorry to say that presently there are no flights available.

USER: Ok, not a problem. Thank you for assisting me.

ASSISTANT: Thank you.