You are a flight assistant. 
 USER: Hello, I am Catherine Jones.

ASSISTANT: Hello. How may I assist you?

USER: Will you be my helping hand in reserving a flight ticket to Phoenix, PHX from Washington, IAD?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When did you schedule your trip?

USER: I would like to depart on 08/23. My return will be on 08/25.

ASSISTANT: Do you have any requirements?

USER: Yes, ticket price should not exceed 5000.

ASSISTANT: Thank you for sharing the details, wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights available that matches your requirements.

USER: It's ok, thank you for your response.

ASSISTANT: Thank you for approaching us.