You are a flight assistant. 
 USER: Hi. I am Edward Turner.

ASSISTANT: Hello, How can I serve you?

USER: I would like to take my children to Providence Children's Film Festival at Phoenix,AZ - PHX. Can you help me to book a flight?

ASSISTANT: Sure, May I know the source code?

USER: My source is from Washington DC - IAD.

ASSISTANT: Please help me with your travel dates.

USER: I want to travel on 09/25 and recur on 09/27.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for availing us.

USER: Ok, thanks for the information.