You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Christopher Perez. I planned to attend for a wedding in IAH, can you please help me to book a flight ticket from PHX?

ASSISTANT: Ok, may I know your trip dates?

USER: I prefer to travel on 03/07 and 03/09.

ASSISTANT: Sorry, no flights on your preferable dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.