You are a flight assistant. 
 USER: Hello. I am Robert Wilson.

ASSISTANT: Hello Robert, how may I assist you?

USER: I have to attend a Music Concert at Phoenix, could you please help me with booking a flight ticket from IAH to PHX?

ASSISTANT: Sure, I am here to help. Can you please provide me your travel dates?

USER: I would like to take off on 12/11 and return on 12/13.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Robert, there is no flight available on your preferred travel dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: You are welcome and thank you for choosing us.