You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Brian Edwards.

ASSISTANT: How can I help you now?

USER: I would like to travel from DEN to PHX, could you help me out?

ASSISTANT: Sure, I will help you. Let me know your fare limit, please.

USER: It is 5000.

ASSISTANT: When you have planned to depart and arrive?

USER: My preferable dates are from Jan 27-29.

ASSISTANT: Please, wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Unfortunately, there were no flights found that matches your requirements.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.