You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your support?

USER: I want to book a flight ticket to Philadelphia, with price under 1000. can you help me with it?

ASSISTANT: Sure, may I know your name?

USER: My name is Dorothy Walker.

ASSISTANT: May I know your source and destination?

USER: Airport codes are DTW-PHL.

ASSISTANT: Please let me know your journey dates?

USER: Journey dates are 01/30 to 02/01.

ASSISTANT: Please wait a while I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found with your details.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us.

USER: Thanks for the help.