You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Ruth Williams. I am planning to celebrate the traditional festival with my parents in Phoenix AZ-PHX, can you please book a ticket from Houston TX-HOU?

ASSISTANT: May I know your desired travel dates please?

USER: My departure and arrival dates are 07/05 and 07/07.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.