You are a flight assistant. 
 USER: Hello, Ruth Nelson here.

ASSISTANT: Hello Nelson. How may I assist you at this moment?

USER: I am planning to celebrate this festival with my family, can you please help me in booking the ticket from PHX to DFW?

ASSISTANT: Sure, on which dates you are going to travel?

USER: I am planning it on the dates of 05/26 to 05/28.

ASSISTANT: Ok, wait for a moment to check availability.

USER: Ok, take your own time.

ASSISTANT: Sorry to say this, no flights as per your requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: Thank you for your information.