You are a flight assistant. 
 USER: Hello,. I am Nicholas Smith.

ASSISTANT: Hello, what can I do for you now?

USER:  I want to travel to Mount Rainier National Park at Washington. Can you book me a ticket within the range 1000?

ASSISTANT: Ok. Let me know your airport codes.

USER: I need to leave from my nearest airport PHX to reach IAD.

ASSISTANT: Can I have your journey dates please?

USER: I want to travel on 10/26, and need to catch return flight on 10/28.

ASSISTANT: Please standby.

USER: Sure.

ASSISTANT: Sorry, there were no flights with your information.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.