You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Pamela Harris.

ASSISTANT: How can I help you?

USER: Can you please book a flight ticket from DEN to PHX? As I need to attend a cultural fest in Phoenix.

ASSISTANT: Sure, I am happy to help you. Could you provide me your travelling dates?

USER: Sure, I need to travel on dates of 04/01 and 04/03.

ASSISTANT: Ok, wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, no flight's available based on your travelling dates.

USER: Oh! It is sad to hear. Anyway, I will choose another agency this time.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your time.