You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I assist you?

USER: I am heading from Phoenix to meet my cousin at Washington, DC - IAD. Can you help me book a flight ticket?

ASSISTANT: Sure, may I know your travelling dates.

USER: I will depart on 12/22 and return on 12/24.

ASSISTANT: May I know your good name?

USER: Stephen Miller is my name.

ASSISTANT: Please provide your source code.

USER: I would like to travel from PHX.

ASSISTANT: Unfortunately there is no flight found with your requiremwnts.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.