You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Myself Benjamin Carter here. I would like to travel with my cousin, can you please help me to book a ticket from DC-DCA to AZ-PHX?

ASSISTANT: Sure Carter, I will help you to book a ticket. Can you please provide me your travelling dates?

USER: My dates of journey is from 05/27 to 05/29.

ASSISTANT: Ok, give me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry Carter, there is no flight found for you.

USER: Ok, that's fine.

ASSISTANT: Thank you for choosing us.

USER: Welcome.