You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jason Miller here.

ASSISTANT: How can I aid you?

USER: Can you help me to book a flight ticket from PHL to AUS?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travelling dates are 15 and 17 of May.

ASSISTANT: Do you have price limit?

USER: I can afford only 5000.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: It's ok, not a problem.

ASSISTANT: Thank you for reaching us.