You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: This is Steven Perez.

ASSISTANT: Ok.

USER: I want to book a flight ticket from TX - AUS to AZ - PHX. Can you help me in that?

ASSISTANT: Sure, help me with the trip dates?

USER: I want to start my journey on 11/16 and return on 11/18.

ASSISTANT: Do you have any price limit?

USER: I can afford up to 5000.

ASSISTANT: We do not found any flights running in your desired routes.

USER: Ok, it is not an issue. Thank you for your service.

ASSISTANT: Thank you for approaching us. Have a nice day.