You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Christopher Williams, I am planning to go for my friend's birthday party from SFO to PHX can you find a ticket for me ?

ASSISTANT: Please provide your travelling dates.

USER: Yes, I am planning for 2 days that is 04/29 to 05/01.

ASSISTANT: Sorry Christopher, there is no flight available with your request.

USER: Ok, thank you.

ASSISTANT: Thank you for contacting us. Have a nice day.