You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself John Hall, can you help me to book a flight ticket from LAX to PHX?

ASSISTANT: Sure, may I know your dates of journey please?

USER: Ok, the travel dates are 06/19 and 06/21 respectively.

ASSISTANT: Please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry John, there is no flight found as per your travelling details.

USER: That is ok, thank you.

ASSISTANT: You are welcome always.